ITI 



PAUMOXIIU 



PALKMONID.E. 



Mperkir antenna* dedJsr, and not carrying any lamellar appendage, 

 a* in UM P*uri ; terminal filamente of thoee organ* long and cylin- 

 drical, and two in number. Low*r antenna) presenting nothing remark- 

 able, Mandibles strong, and fumiabed with a palp which u but little 

 eolargfd, and reesnblinc that of the Palemon* rather than that of the 

 Anal External jaw-feet alender. elongated, and provided with a 

 palp * b nearly rudimentary. Fint three pain of feet didactylou-, 

 and 1-nc.meinl.j lntreaiin( in length ; third pair much stouter than 

 the uthera, and very apiay. La*t two pain of feet very long also, 

 bat aliform, and with thrtr last two joint* divided into a multitude 

 of (Ball ring* : a disposition which is not *ren cither in the Ptruti or 

 the Siefomiar, and which reeal* the structure observable in the second 

 pair of feet of the specie* of y/i/.;w/yff, 4e, The feet bear no lamellar 

 n*r*4*tr as in the Pnuri. The abdomen is of moderate size, and 

 preeente nothing remarkable. (Milne-Edwards.) 



Kx. jtaMpM *iyWdw,- Polemo* Awj.iJm, Oliv., from the Indian 



Si<jtmim (Edward*). Tegument harder than in the greater part of 

 the shrimps. Body (lightly compressed. Carapace surmounted with 

 a median crest, which u continued forward into a rather Urge rostrum. 

 On each aide of the carapace, about its anterior third, a spine directed 

 forward*. Eye* Urge, cylindrical, and exposed. Upper antenna* very 

 abort, their peduncle very (tout, and not presenting, as in the Pena-i, 

 a lamellar appendage recurved above the eye*; their terminal 

 filamente, two in number, extremely short. External antenna; inserted 

 below the preceding, and offering nothing particular. Fint two pain 

 of jaw feet formed nearly the same as in the Peaai, excepting that 

 they are deprived of palp*. Fint three pain of feet terminated by a 

 email didectylou* hand, and elongated from before backwards, as in 

 the preceding MOOS ; the last two pain monodactylous, and the hut 

 much longer than the penultimate pair. None of these organs are 

 mnlti articulate, as in the Slatojii, nor provided with a flabelliform 

 appendage, or a palp, as in the Pentei. Abdomen carinated above, and 

 |ice*nting several furrows, which make it appear as if it were 

 sculptured ; it carries below five pain of false feet, each of which is 

 only provided with a single natatory blade ; the median blade of the 

 caudal fin is pointed and furrowed above. Branchiic 11 on each side. 



Ex. SkCyoaia tcolfta; L'anttr carinaltu, Oliv., from the Mediter- 



(Llreill). Carapace fumiihed above with a more or less 

 it, which i* continued forwards into a nearly straight, 



' 



-, and dentiUtod rostrum ; on each aide, near the insertion of 

 the superior antenna*, a stout tooth, and a curved longitudinal furrow, 

 whioh circumscribe* laterally the stomachal region ; a spine nearly 

 always exiete at th* point of junction of the stomachal furrow and 

 that of the branchial region, and sometime* a small crest is seen 

 between the fint of these furrow* and the builary crest of the 

 rostrum. Kyee (tout and rounded. Fint joint of the superior 

 anteone; very large, and excavated above so as to form a cavity in 

 which the eye* are lodged ; iU external border arm. id with a tooth, 

 and it* internal border with a small lamellar and ciliated appendage, 

 which carve* back upward* and outward*. The last two joints of the 

 pcdoncle cylindrical and very abort ; and the terminal filamente of 

 varying length. The external antenna: present nothing remarkable. 

 Mandiblra provided with a very Urge lamellar palp. Last two pain 

 of iaw feet carrying a very long and multi-articulate foliaceous palp, 

 ana provided aUo with a flabelliform appendage which ascend* among 

 the branchue ; external jaw feet long, slender, and pediform. Fint 

 fear pain of the thoracic feet provided with a flagrum which ascends 

 into UM branchial cavity as in th* crawfishes, and at the base of all 

 the feet a (mall lamellar appendage aoalagou* to the palp of the jaw 

 foot, a mode of conformation which remind* the observer of that of 

 the Stomapod*. The fint three pain of feet terminated by a small 

 didactylous hand, and augmenting progreaeively in length from before 

 backward*. Last two pain of feet monodactylous and of moderate 

 length. Abdomen extremely Urge and v.ry much compressed ; its 

 ior moiety eurmoonted with a median erect more or leu marked. 

 feet not encaeed by the Uteral lamina; of the abdomen, and 

 by two ciliated lamina) of unequal oixe. Caudal fin Urge ; 

 blade triangular, and hollowed below by a median furrow. 

 [taneajii diepoeed in bundle* a in the lobster, 18 on each side, and 

 '**"* *Stn b RJ H * **** fl * btUifom "Ppendogo of the foot situated 



M. Milne-Edward* cubdi vide* the gcnu* into the following sections: ' 

 1. Specie* baring the antenna; terminated by very abort filament*. 

 A median furrow extending from the base of the rostrum to 



the posterior border of the carapace. 



Ex. P. OtnUHtt (Cmvxr A'eraMiirM. Font ; Palemo* nlcatut, 

 Oliv.). It ie f'Mtnd in the Mediterranean. 



Ho median furrow between the UM of the rostrum and the 



posterior border of the carapace. 



P. trti/frtH (Pal,*<m w/i/mu, Oliv. ; Aitaou Jlunatilu Anvri 

 CMB>, Seba). It i* very abundant at the mouths of the riven of 

 i 



S. Specie* having the (uperior aotennw terminated by filament* 



longer than the carapace. 

 Ex. P. eMaOnMewnM, from the Mediterranean. 



M. Milne-Edward* remark* that the genus Mclietrttu of Rafinesque 

 esems to differ but little from Penatu. 



uptema (Milue-Kd wards). General form of the body approaching 

 closely to that of Hippolylt. Carapace terminating anteriorly by a 

 very long rostrum; abdomen bent towards the middle, its second ring 

 prolonged posteriorly into a long spine, which is directed horizontally 

 backwards, as is the rostrum forwards. Eyes large and short. Dispo- 

 sition of the antennae presenting nothing remarkable ; the fint pair 

 have, as usual, their fint joint excavated above for the lodgment of 

 the eyes, and terminate by two multi-articulate filaments ; the second 

 pair of antenna: are inserted below the preceding. Mandibles short, 

 stout, but slightly dentilated, and provided with a palpiform, short, 

 wide, and Inarticulate stem ; the valvular appendage of the jaws of 

 the second pair U oval, and only a little prolonged backwards. The 

 last two pain of jaw-feet are moderate, pediform, and provided with 

 a lamellar palp nearly as long as the internal stem ; they also carry at 

 their base an appendage which represents the flagrum, but which M 

 membranous and vesicular, nearly as in the Amphipods. The fint 

 three pain of thoracic feet are terminated by a small imperfectly 

 didactylous hand ; and the last two pain are monodactylous ami 

 strongly ciliated, so as to be rather natatory than ambulatory ; all 

 carry at their base a small very short flagrum, as well as a lamellar 

 palp. The appendages of the first five rings of the abdomen are com- 

 posed of a cylindrical peduncle and of two terminal joints, as in the 

 ordinary Salicoques, only the blades are not ciliated. The caudal fin 

 presenta nothing remarkable. Branchial lamellar, and fixed in many 

 rows on each side of the thorax. 



Ex. E. armala, the only species known. It inhabits the Southern 

 Atlantic. 



A'y./iyi-a (Roux). Body laterally compressed ; carapace smooth ; 

 abdomen carinated, and rostrum dentated. Jaw-feet very much 

 elongated ; and the thoracic feet carrying at their base a pnlpiforui 

 appendage, but not appearing to have a point as in the next genus. 

 First two pairs of feet small, shorter than the succeeding ones, and 

 didactylous ; carpi simple. 



Ex. A', ptlagica. It is taken in the Mediterranean, at great depths. 



Oplojthortu (Milne-Ed wards). Body not compressed. Carapace termi- 

 nated by a styliform rostrum, which is very long and dentilated on it* 

 two borders. Peduncle of the superior antenna: very short, and one 

 of the terminal filaments very stout and pyriform at its base, but 

 soon becoming slender and cylindrical like the other; the lamellar 

 appendage of the external antenna; differs much from that of all tin- 

 other shrimps ; it is Urge, narrows gradually from its base, terminates 

 in a very sharp point, and presents a series of spines on its external 

 edge. External jaw feet short, and carrying externally on extremely 

 large lamellar palp. First two pairs of feet very short, terminated by 

 a very small bund, and provided at their base with a very large and 

 ciliated lamellar appendage ; three succeeding pairs of feet moderate 

 and monodactylous, the appendix fixed at their base small ; and the 

 tanus of the third and fourth pain styliform and very large, whilst 

 that of the posterior feet is rounded and extremely short ; there is 

 also at the base of each foot a small flabelliform appendage, which 

 ascend* among the bronchia:, a'nd the number of these last organs is 

 nine. Abdomen differing but little from that of JJiji/iolyte. 



Kx. n. Typut, from New Guinea. 



Patijihaa (Savign ; Alpheiu, Risao). Body remarkably flat laterally. 

 Koxtruin very short, or even rudimentary, and the cft-apaco much 

 narrower forward than behind. Eyes moderate and directed forward. 

 Peduncle of the internal antenna* slender, and terminated by two 

 multi-articulate filaments, one of which is rather long; external 

 antenna; inserted below the preceding, and offering nothing remarkable. 

 Mandibles strongly dentated, and deprived of a palpiform stem. 

 External jaw-feet very long, slender, and pediform ; at their base a 

 lamellar and ciliated palp as in th- /'. <ri. The thoracic feet carry 

 also, suspended at the external side of their basilary joint, a rather 

 long lamellar appendage of the same form, but membranous and but 

 little or not at all ciliated. Two fint pain of feet rather stout, nearly 

 of the same length, armed with spines on their third joint, and termi- 

 nated by a didactylous hand, the pincen of which are slender ami 

 furnished with a series of sharp spines on the prehensile border. The 

 next three pain of feet ore very slender, monodactylous, and more or 

 lew natatory ; in general, if not always, the penultimate pair are much 

 the shortest. Abdomen very long and very much compressed. False 

 feet of the first ring terminating by a single blade, but those of t In- 

 next four feet carrying each two short natatory and but little ciliated 

 blade*. The sixth abdominal ring very long, and the seventh short 

 and triangular. External blade* of the caudal fin Urge and narrowed 

 toward* the end. 



Ex. /'. Sivado from the coasts of Ni.-c*. 



Sergatct (Edwards). Body slender and a little flattened ; carapace 

 presenting anteriorly a small spine in lieu of a rostrum. Eyes very 

 much projecting, and the ophthalmic ring on which their peduncles 

 are inserted not completely covered by the carapace. Upper ant<-mi:<- 

 extremely long, and carrying, besides" the principal terminal 111 HIM nt, 

 two rudimentary filaments. External antenna; inserted below the 

 ing, and also very long. Second pair of jaw-feet nearly p'-diform 

 and without either palp or flabelliform appendage, long, slender, bent 

 back on themselves, and applied upon the mouth. Appendages which 



