HII'IM DBS 



HIl'PIDES. 



<rabrit*BA-Mo*t analogoos of any of tbe tribe to the 

 Hsim. s. ii ill lij Itiilr riTiinl forma* by the disposition of their 

 ML Their oarapaee, wnioh i. straight from before lckwar.U, and 

 n lnMsiiy. ii only Uttte prolonged boT UM base of the 

 II is tmniaated anteriorly by a nearly straight border, which 

 Bin Ita whole width ; it is of an oral th,,.,,, posteriorly and 

 Mnssrlv nou*ed for the iawrtioo of the abdomen. A mull mesial 

 m*MU th* rovtrum. Tb* ocular peduncles arc large and 

 i i , wbiUt UK eyes, situated on their external bonier, are 

 extremely omalL The internal anUons> are rrrj large, and they are 

 rticlate filament long, r than the body, 

 tod on lie edge*. The external antenna 1 . 

 I Dearly am th* same line u the internal, are Urge, abort, an 1 

 tod by a email etnn eompoeed only of from seven to eight mall 

 The external jaw-feet are more or leas |diform ; their second 



and third joint* are almost cylindrical, and the terminal portion formed 

 by UM thre* Ust joint* i* snmetim** as long, and almost as Urge, 

 a* the haailsry portion. The feet are abort ; the first pair are terrai- 

 1 by a Urge hand ralhrr suboheliform than cheliform, the moveable 

 "f to it* anterior border, tbe lower angle of which 

 nd consequently doe* not really constitute an 

 Th-.- three following pairs are nearly of the same 

 fans, and terminate iu a falciform joint The posterior feet are 



\ filiform. The fat ring of tbe abdomen ii amall, and received 

 in a Botch of UM carapace ; tbe second U, on the contrary, very large, 

 and preeenta on each aUe a oooaiderable lamellar prolongation, which 

 ride* a little on tb* carapace. The third and fourth abdominal seg- 

 dimmi*h progressively, but are nearly of the same form as the 

 ; while the fifth, tilth, and aerenth are rery narrow, and 



no Uural prolongation ; the aixth supports a pair of falw 

 y fret, terminated by two oral lamimr ; and the seventh has 

 th* form of a nearly eircuU'r lamina. (Milne-Edwards.) 



AHmutm Symmala may be Ukcn ai an example. The length of the 

 >is 10 lines. It inhabit* the aeai of Aria. 



Kfmifti (LatrssUcV Carapace nearly regularly oral, convex, and 

 than OM* and a quarter aa long a. it u wide ; front rather large 



and lea 

 and 



orbita aemicircalar, and their external angle much more 

 than th* front The ophthalmic ring U covered above by 

 the froal, but u not surrounded by the carapace ; th* ocular pedun- 

 cle* are nnsnpuuJ of two moveabl* portions, one baailary, which in 



I and short, th* other terminal, cylindrical, slender, carrying at 

 iu extremity a very snail imperfectly retractile cornea ; the eyes, in 

 feet, can scarcely be tamed backward*, as in tbe greater part of the 

 Hecspuiis, hat advance and recede a little by the motion of the 

 basUary tMTtionof their pednncl*. Tbe Internal antenna- are inserted 

 beiow the has* of tbe ocular peduncle*, and are very large ; their 

 Wdlary portion I* ompoasd of three joint* nearly of th* same six*, 

 and their terminal portion consists of two long filament* which are 

 aMsHi rti.hs, stout, and dirseted forwards. The external antenna 



__ J UM internal. Marly on th* aame line, and under 

 th* Utrro anterior edge of tbe carapace ; they are abort but very 

 Urge; their fir* joint i* much wider than it U long ; the aecond ami 

 the third are nearly of the *am* dimensions, and tb* succeeding 

 joint* diminiab rapidly in volume, Tbe buccal frame U not closed 



anteriorly. Tbe external jaw-feet are wide ami short ; their first 

 joint U nearly globular, and carries neither palp* nor flagrtim ; the 

 aecoml joint, which is so large in the llraehyra, is rudimeutary here ; 

 and it u the third, which, becoming very large and nearly oral, consti- 

 tute* lolely the specie* of operculum formed ordinarily by the aecond 

 and third joint* united ; the three last joints form a sort of large 

 claw, which applies iUelf against the anterior border of the third 

 joint. The jaw-feet of the second pair are equally destitute of the 

 flagrum, but have a flabelliform palp; it U the aame with the anterior 

 jaw-feet; their palp i* lamellar, dilated anteriorly and ilUposed 

 nearly a* iu the Oxys/omo. Tbe jaw* of the second pair present 

 nothing remarkable; those of the first pair are very small Tbe 

 m.mdible, which is strongly dentilated, U furnished with a palp com- 

 posed of two small lamellar joint*, separated from the body of the 

 mandible by a luge membranous furrow ; the sternum is linear. Tha 

 Ulterior feet are long; their second and third jiubs are enlarged ; 

 but the last three are cylindrical ; and the last, which is nearly a* 

 long as the preceding one, is slightly flattened, pointod, and incapable 

 of being bent back upon it. The two following pairs are large, and 

 terminated by a large hastiform lamina ; the fourth pair are held by 

 a amall nearly conical joint. The fifth pair are aleuder, long, and 

 membranous, and are bent back upon the lateral prolongation 

 carapace. The last thoracic ring, which supports these appen 

 is complete above, moveable, and not covered by the carapace, so t Ii it 

 it might be easily taken for tbe first abdominal segment. The abdo- 

 men is very large, and presents on each side a lamellar oral prolonga- 

 tion which rides upon the carapace ; ita anterior border is notched 

 for the lodgement of the second abdominal ring, which is oral ; the 

 third and fourth segments diminish progressively in volume ; the lift It 

 and sixth are equally small, but are soldered together; and tho 

 seventh has the form of a great triangular lamina, the length of 

 which exceeds that of all the rest of tbe abdomen. The first three 

 rings in the female are furnished with simple oviferous filaments ; th,- 

 fourth and fifth rings are without appendages, while the sixth ring 

 carries a very large pair uf false natatory feet, terminated by two 

 raised oval plates which are ordinarily bent forwards. (Milue- 

 Kd wards.) 



Remiptt tettutlinarnu may be given as an example. The length 

 of the carapace is about 15 lines. It inhabits the coast* of 

 Australia. 



Ktmipet ttitudinariui. 



7/i>;xi (Fabricius). When Fabricius established the gmius it was 

 much more extensive in it* limits, and at present it only contains 

 those Hippians whose external autennic are terminated by a long and 

 stout multi-articulate filament. Body oval, or rather ellipsoid, being 

 rather less wide forward than backward. Carapace truncated poste- 

 riorly, very convex transversally, and presenting toward* th* middle 

 a transversal curved furrow, which indicates the posterior tenuity (.f 

 the stomachal region ; its latero-anterior border is concave, but its 

 latero-poeterior border is very convex. The rostrum is small and 

 triangular, and on each side of it* base is a notch which exposes the 

 insertion of the ocular peduncles and the internal antenna:, and which 

 is bounded externally by a projecting toi.th which advances above 

 the internal edge of the great autennic. The ophthalmic ring, which 

 is covered in it* mesial part l>y the rostrum, is of a horse-shoe shape, 

 and its two extremities are exposed ; the ocular peduncles, inserted 

 at it* extremity, are composed of three pieces, and of these the two 

 basilar, which are very short, are bent under the carapace in the form 

 of V, and the last, which is slender, cylindrical, and very long, 

 advances between the internal and external antrnntc, and terminates 

 by a small pyriform enlargement which carries the cornea. The 

 internal antenna; ore of moderate size, and their bosilary joint, which 

 is cylindrical and a little curved downwards, is hardly larger than 

 the succeeding one, which is furnished on the external side with a 

 strong tooth directed forwards ; the third joint is short, and give* 

 insertion to two multi-articulate stemlot* (tigelles). The external 

 antemue are very large, but easily escape observation, for they aru 



