Stomapoda. 209 



Cryptopus, Lair. 



A subovoid inflated shell, curving downwards on the sides, enve- 

 loping tlie body as well as the antennee and feet, exhibiting beneath 

 a mere longitudinal fissure. The eyes are separated, and the feet in 

 the form of thongs, with a lateral appendage *. 



There the eyes are concealed ; the intermediate antennae are coni- 

 cal, inarticulated, and very short ; the laterals are composed of a 

 peduncle, and a thread without any distinct articulations. There is 

 no — at least salient — scale at their base. Such is the 



MuLCioN, Latr. 



The body is soft and thorax ovoid. The feet are in the form of a 

 thong, and most of them have an appendage at their base ; the fourth 

 pair is the longest. 



I know but one species, the Midcion Lesueurii, which was 

 captured by that zealous naturalist in the seas of North America. 

 The late Olivier, in the Pinna marina, found a crustaceous 

 animal very similar at the first coup d'oeil to the Lesueurii, 

 butthe specimens were so much injured that it was impossible for 

 me to study their characters. 



The Nebalife, which we at first placed in this section, having no 

 natatory appendages under the last segments of their body, and their 

 feet being tolerably similar to those of a Cyclops, will pass with the 

 Condylura into the order of the Branchiopoda, at the head of which 

 they will stand. The Nebaliae, by their very prominent eyes, which 

 seem to be on pedicles, and by som-c other characters, appear to con- 

 nect the Schizopoda with the Branchiopoda. 



ORDER 11. 



STOMAPODA. 



The branchise of the Stomapoda are exposed and attached to the 

 five pairs of sub-adominal appendages, exhibited to us by that part of 

 the body, called tail, in the Decapoda, and which here, as in most of 

 the Macroura, are fitted for natation, or are fin-feet. Their shell is 

 divided into two portions, the anterior of which supports the eyes and 

 intermediate antennae, or composes the head, without giving origin to 

 the foot-jaws. These organs, as well as the four anterior feet, are 

 frequently approximated to the mouth on two lines that converge 



* Cryptopw De/rcncii, Latr.. from the Mediterranean. 



