ORDER DECAPODA HYAS. 



(EXTRALIMITAL.) 



Genus Leptopodia, Leach. Exterior antenna; short. Rostrum slender and much elongated, not 



emarginate. The second pair of feet much longer than all the others; pincers slender. 



linear. Eyes not retractile, and on a short peduncle. 



L. calcarata. (Say, Jour. Acad. Nat. Sc. Vol. 1, p. 455. Edwards, 1. c. Vol. 1, p. 276.) Third joint 



of the last four pair three-spined at their tips ; the middle spine obtuse, and half as long as the next 



joint. Ocular peduncles slightly projecting before the eyes in an obtuse spine. Length, 1-0; 



transverse diameter, 0*25. Charleston, S. C. 



GENUS HYAS. Leach. 



Shield very tubercular, subtriangular, rounded behind, with the rostrum advanced and emar- 

 ginate. First joint of the exterior antennae larger than the second, and compressed and 

 dilated externally. Pincers larger but shorter than the other feet. Eyes on short pedun- 

 cles ; orbits with a fissure above and behind. Feet all terminated with a long conic and 

 somewhat arched nail. 



Hyas coarctata. 



PLATE VII. FIG. 14. 



Hyas coarctata. Leach, Malacostr. Podopth. Brit. pi. 21, E. 



H. id. Desmaeest, Consid. generates, p. 148. 



Lismfissiroslra. Say, Jour. Aead. Nat. Sciences, Vol. 1, p. 79. 



H. coarctata. Milne-Edwaeds, Hist. Nat. des Crust. Vol. 1, p. 312. 



H. id. Gould, Invertebrata of Mass. p. 326. 



Description. Shield wide in front, tapering from behind to the orbits, verrucose, and co- 

 vered with short hooked hairs. External angles of the orbits with a large triangular spine. 

 Rostrum depressed, broad at the base, and deeply cleft. Hands equal, linear, not much 

 larger than the feet, but shorter. The shield strongly coarctate on the sides behind the external 

 orbital angles. 



Color, greenish brown ; but on the removal of the incrustation, brownish tinged with 

 reddish. 



Length, 2*0. Greatest transverse diameter, 1*5. 



This Crab, which was first described by Leach, occurs along the coast of Long island, and 

 is found in deep water along the northern coast, where it affords an abundant supply of food 

 to the Cod-fish. It is probably a boreal species, not extending south of the seacoast of 

 New-York. 



1* 



