ORDER DECAPODA — HIPPOLYTE. 27 



GENUS HIPPOLYTE. Leach. 



Antenna; arranged in two series. Rostrum large, immovable, lamellar, compressed and den- 

 tated. Feet all slender ; the two first pair didactyle. Internal antennae ending in two long 

 threads. Inhabiting all seas, and occasionally found in fresh water. 



HlTPOLYTE SOWERBYI. 



(CABINET OF THE LYCEUM OF NATURAL HISTORY.) 



Cancer spinus. Sowerby, British Miscell. pi. 21. 



Hypolde souerbyi. Leach, Mai. Podoplh. Biitt. pi. 39. 



H. id. Desmarest, Consid. sur les Crustaces, p. 222, pi. 39, fig. 1. 



H. id. Milne-Edwards, Hist. Nat. des Crustaces, Vol. 2, p. 380. 



Description. Rostrum short and wide in front, truncated at the end, risng from the poste- 

 rior part of the shield, with four or five teeth on the part attached to the shield, and with 

 seven or eight small ones on the upper side of the detached portion. The under side of the 

 detached portion with two teeth, of which one almost extends to the tip. Lamellar appen- 

 dix of the external antennae large, ovate, and extending beyond the rostrum. The spine-like 

 plate of the peduncle of the internal antenna? very long ; the terminal threads of these organs 

 very short. Outer jaw-feet moderate. Anterior feet scarcely exceeding the peduncle of the 

 outer antennas. The carpus of the second pair divided into seven or eight very distinct articu- 

 lations. Third abdominal segment with a sharp medial process, advanced over the next 

 segment. Medial caudal plate with six to ten teeth on each side. 



Color, light greenish horn. 



Length, 1-5-2-0. 



A specimen of this species is now in the Cabinet of the Lyceum, obtained by Mr. Zabris- 

 kie from the stomach of a Cod-fish on the coast of this State. 



HlPPOLYTE ACULEATUS. 



PLATE IX. FIG. 31. 



Cancer aculeatus. Fabricics, Faun. Grcenlandica, p. 239. 



Alpheus id. Sabine, Appendix to Parry's Voyage, pi. 2, fig. 9. 



Hippolyte aculeatus. Milne-Edwards, Hist. Nat. des Crustaces, Vol.2, p. 380. 



H. id. Gould, Invcrtebrata of Massachusetts, p. 332. 



Description. Shield arched above. Rostrum slender, scarcely exceeding the penduncle of 

 the upper antennas, and continuing posteriorly until near the posterior margin of the shield. 

 Four or five large teeth on the attached part of the rostrum ; three or four very small teeth 

 on the upper edge of its anterior portion, and three on its lower edge. Jaw-feet long, ex- 



4* 



