STOMAPODA. 423 



These minute and delicate Crustacea are peculiar to the Atlantic Ocean and the Indian - I Bngera of the 



large claw-legfl are not toothed. The second joint of the ocular peduncles is macb larger than the basal joint, and 

 in the form of a reversed cone. The eyes themselves are large, and nearly globular. The appendage! of the 

 swimming or fin-feet resemble those of the SquiiUe. 



Briekthut, Latr. (Smerdit, Leach], has the basal joint of the ocular peduncles short, ami the carapu dilated at 

 the sides. Type, E. rilreus, Latr. 



Alima, Leach, has the basal joint of the ocular peduncles much longer, the body much narrower, with the i 

 of the carapax not dilated. Each of its angles forms a spine, of which the two posterior are the most acute. Type, 

 .1. hyal'uui, Latr. 



[SquUlertcthu*, Edwards, has the claws of the great feet armed with spines.] 



THE SECOND FAMILY OF STOMAPODA — 



Bll'ELTATA, Latr., — 



[Comprises the Glass-Crabs, which] have the carapax divided into two shields, the anterior of which 



is very large, more or less oval, composing the head, and the second, corresponding with the thorax, is 

 transverse and angulated in its outline, and bears the foot-jaws and the ordinary feet. 

 Those feet, with the exception of the posterior pair, as well as the last pair of foot- 

 jaw s, are slender, filiform, and for the most part very long, and accompanied by a 

 lateral, ciliated [short and slender] appendage. The four other [anterior] foot-jaws 

 are very minute and conical. The base of the lateral antennae is not furnished with 

 a scale, and the intermediate ones are terminated by two filaments. The ocular pe- 

 duncles are very long. The body is very flat, membranous, and transparent, with the 



Fi». io.-PMioiomi abdomen small, and without spines to the posterior swimmeret. In respect to their 

 ciartcorols. nervous system, tiny appear to be intermediate between the preceding and following 



Crustacea. 

 This family comprises only the single genus PhyUotorna, Leach, of which all the species are inhabitants of the 



Atlantic and Eastern < tceans. [M.GueVin has published a monograph of this genus, with figures of all the spei 



in his Magari* de Xmi/vi/ie.] 

 [M. Bdwards has recently added another genus, Amphioit, differing from Plii/Uosomu in its narrower body, and 



in the carapu extending behind over the whole body, thus rendering Latreille's name, Bipeltata, inapplicable.] 



Those Malacost&aca which have the eyes sessile and immoveable, form the second 

 general subdivision, [and have heen collectively named Edriopthalma by Leach] . 



The [Branchiopodous genus] Branchipus comprises the only Crustacea which remain 

 to he noticed, having the eyes placed on long footstalks ; but in them the peduncles are 

 neither articulated nor lodged in cavities expressly for their reception, and they are 

 not only destitute of a carapax, but differ in many other natural characters [from the 

 Podopthalmous Malacostraca] . 



All the Malacostraca of the present [sub] division are equally destitute of a carapax. 

 The body, following the head, is composed of a series of articulations, of which each of 

 the Seven anterior ones is generally provided With a pair of feet, and of which the 

 following and terminal segments (not exceeding seven in number) form a kind of tail, 

 dnated by a swimmeret, or appendages in the shape of styles. The head i> 

 furnished with four antenna", of which the two intermediate ones are superior; two 



eyes, and a mouth composed of two mandibles, a tongue, tWO pair Of tna\illa\ and a 



sort of lip formed by the two foot-jaws, which correspond with the fourth [or inner] 

 pair in the Decapoda; a- in the Stomapoda there is no flagrum. The four outer foot- 

 jaws are transformed into feet, sometimes Bimple, sometimes terminated in a (daw, 

 but almost always with a single finger. According to MM. Audouinand Edwards, the 

 two ganglionated nervous cords are perfectly symmetrical and distinct throughout their 

 entire length, and from the observations of Cuvier the Onisci only diffi r in thos 

 not presentin ; the uniformity in all the segments of the bo ly, and that there are fewer 



