DECAPODA.. 77 



Cryptopus, Latr. 



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

 loping the body as well as the antennae and feet, exhibiting beneath 

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

 the form of thongs, with a lateral appendage(l). 



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 Mulcion Lesueurii, which was 

 captured by that zealous naturalist in the seas of North Ame- 

 rica. The late Olivier, in the Pinna marina, found a crusta- 

 ceous animal very similar at the first coup d'oeil to the Lesueu- 

 rii, but the specimens -were so much injured that it is impossible 

 for me to study their characters. 

 The Nebaliae, which Ave 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 Nebalias, by their very prominent eyes, which 

 seem to be on pedicles, and by some other characters, appear to 

 connect the Schizopoda with the Branchiopoda. 



ORDER 11. 



STOMAPODA. 



The branchiae of the Stomapoda are exposed and at- 

 tached to the five pairs of sub-abdominal appendages, exhi- 

 bited to us by that part of the body, called tail, in the De- 

 capoda, and which here, as in most of the Macroura, are fitted 



(1) Cryptopus Defrancii, Latr., from the Mediterranean. 



