T II A 





T 11 A 



ttalassina. 'Lativ; 

 Gfnfrif ' 

 much elevated, 

 wards by a deep fun 



ually separated 1'iom the branchial 

 ntini: by their junction 11 trianu'lc. 'he apex of which is 

 ' aimed with a Miial! triangular 

 small and cylindrical. Internal antenna 

 - : their peduncle of moderate 



in. I their terminal lilanients slender anil unfi|iml. the 

 longest about thiicc tin length ol'the peduncle 



small, their peduncle ryliniinral. hardly 

 Beaching beyond the rostrum, and presenting b< 



. of appendages. External j '- and 



pediform, their second joint armed with spimform teeth on 

 its internal surface, and nearly of the same form as the 

 succeeding ones. First pair of"/.'/ narrow nnd moderately 

 elongated, hut rather rohust ; they are unequal, and the 

 hand which terminates them present at its anteri< 

 lower angle a more or less strong tooth, which rep: 

 an immoveable finder, against whicli the base of the 

 able finger, which is very large, is bent back. Second pair 

 of feet very much compress, a. and rather wide : their pen- 

 ultimate joint especially i- large and ciliated below. The 

 succeeding feet have nearly the same form, but tin \ arc 

 narrower, and less and less compressed. Ab<l<n> // very 

 long, narrow, semicylimlrical, and nearly of the same si/e 

 throughout its Icnirth. Terminal fin small ; the two pairs 

 of lateral blades, formed by members of the sixth rinsr. 

 nearly linear. Palteffet fixed to the four middle rings of 

 the abdomen ; they arc very slender, and composed of a 

 cylindrical and elongated peduncle can-vim: two more or 



Hated multiarticnlate filaments. (M 

 Example, Thalassinn seorpionidtt. Length about six 

 inches. Colour brownish. 



Locality. Coasts of Chili. 



M. Mime Edwards remarks that the abdomen of this 

 species reminds the observer of the body of a Scolof* 

 2, GaMrobr.im bids. 



M. Milne Fxlwards observes that this small division of the 

 Tkalaitinittn* is very remarkable, for it establishes the 

 PMMgc between tttt CbttMMM and the Kjiu//rr>. In 

 ibe general form of tlw body, the crustaceans forming this 



li\ ision differ, lie remarks, 1 tie from the first, and 



the conformation per- 



mit their separation from the marmtor.s decapods, nor tneir 

 distant removal from the Thatassinians ; but they have 

 respiratory v vet, 



exhibiting the cn.-sti-l analogy v. itli the ramose branchise 

 of the SrojfAPODs. 



The type of this group, according to M. Milne Edwards. 

 is a small crustacean, to which he irives il,. name 



i : but he also arranges in this same division the 

 "!' M. (iuerin. under the name of Cnllian.- 

 for he thinks that he perceives in this last an nnali' 



limn. If, he observes, the chin 

 to it by M. (Jiierin be exact, it would be difficult to 

 place this new reiitis here, and it ought to be approximated 

 \o\hePazurians; but it appears very probable to M. Milne 

 Edwards that there has been some error of observation, and 

 that in reality the hra- and CaUiam'dett&ffer but very little. 

 These crustaceans, M. Milne Kdwm -.have all 



a very small oval thorax ci a 'do- 



men, on the conlraiy. is extremely lonir and slender. The 



i'ioi\ of the e\cs and the aiitcnn. 

 as in Callianatta. The external jaw-feet are 

 and carry externally a slender and multiarticulate 

 two fii-st pairs effect are didaeh lous : the anterior pair are 

 long, very unequal, and terminated by a stunt r 

 hand : the second are small and very delicate : the third are 

 enlarged towards the end nearly as in ('nlliniitiitxa, and 

 terminated by a \ciyshort tarsus, forming, with a till 

 ol'the preceding joint, an imperfect claw. The fourth pair 

 of feet are slender and monodactyle : and the filth pair, 

 small in dimension, arc thrown backward*. As in the 

 Crpytobratuhid,\he alKlomcn is very long, sufficiently soil. 

 and composed of nearly equal rinirs. of which the dorsal 

 arch is not prolonged below so as to incase the base of tin- 

 false feet. The caudal fin offers nolhinir remarkable : but 

 the false feet, inserted at its lower surface, are fun 

 with a multitude of branched filaments, which have a struc- 

 ture very analogous to that of branchia 1 . and which cer- 

 tainly must be destined to concur in the work of respiration. 



M. Milne Edwards concludes by observing that this tribe 

 comprehends two genera, one of which appears to him to be 

 too imperfectly known to be conveniently characterized. 

 ( \illiniiiilea. (Edwards. 



(irnerir Chnrattrr. Bo'ly very delicate, slender, and 

 elongated. Carapace hardly a third of the length of the 

 abdomen, and not covering the last thoiacic rins. com- 

 d and rather elevated, its lower border applied ex- 

 actly aitainst the base of the four first pairs of feet. No 

 rostrum, and the anterior border of the carapace notched 

 on each side of the median line for the reception of tin- 

 base of thi- i 'i/i v. whose peduncles are very short, and 

 formed as in the ('ii//iiiinixrr. Vm\rnntfnna: slender and 

 inserted nearly on the same transversal line : the first pair 

 terminated b\ two filaments nearly equal in length, one of 

 which however is the largest, and slightly convex towards 

 \ppendaL'es ol'the innitth MTV small, occupying 

 but little space : ithi/iil.li'i-x haulh iliil'cnnir from UK 



: valvular appendage of the -econd pair of _/'u//-. 



mall ; external ja'r-fi,-! slender and pediform. their 



: joint furnished internally with a row of dentiform 



tubercles covered with haii-s, and with their three last joints 



uinch eloiiL / linear throughout it 



tent. Kiist pair of fi-ft long, and one of them very stout, 

 with the terminating hand very large, and nearly of the 

 same form as in (V/,'<i>-<j. except that tin 

 smaller. The two succeeding pairs of feet are small and 

 flattened ; the fourth pair nearly cylindrical, and their ba- 

 silary joint very much enlarged. Fifth pin: large 



fouithjiind terminating in an imperfect rudimentary 

 claw. composed as ordinarily of n 



neaily of the same size throughout, and canyin 1 : beneath 

 five pairs of faht-tret : of these the fiiM are reduced to a 

 simple narrow blade slightly ciliated at the end. but the 

 four succeeding pairs have a very reinnrkabi. lion. 



A peduncle is to be distinguished and three teiminal la- 

 minap, two of which are very large and on. ill on 



the edge of the preceding ones ; all round the border of the 

 treat laminip a kind of tufted fiinge is found, composed ol 

 a row of cylinders, each of which cues oiii:in to two smaller 

 filaments, which again in their turn are bifurcated nearly 

 in the sarnp manner ta the branchial filaments of the 

 an divided. The five blades of which the caudal 



