\ 



GENUS LISSA. 79 



Genus LISSA. Leach. 



Maja of Fabr. andLatr. 



Thorax tuberose, with a fissile rostrum^ rostrum with 

 the h\cin.2e meeting; eyes rather thicker than iheir pedun- 

 ckr; orbit with one fissure below and another behind. Ex- 

 ternal antenna \viih the basal joint thicker and longer than 

 the next. External double pedi-palpi with the second joint 

 of their internal peduncle, half as large as the first, and trun- 

 cate; emarginate. Anterior feet hardly thicker than the 

 others (of the male, as long as the body; of the female, 

 sliorter than the body;), which are similar to e<\ch other and 

 of moderate length; tarsi simple. 



1. X. fssirostra. Rostrum depressed, fissile, taper- 

 ing to the tip; thorax verrucoscj terminal joint of the ab- 

 domen transversly cliptical. 



Inhabits the coast of Long Island. 



Thorax destitute of spines, unequal, a little verrucose, 

 gradually tapering from behind to the orbits, sides rather 

 abrui>tly deflected not decurved, impressed above the inser- 

 tionof the anterior feet, edge of the thorax verrucose, edge 

 of the shell uninterrupted; orbits of the eyes round and 

 equal before, without any spine or tooth in front, poste- 

 rior canthus with a large, triangular, prominent, depress- 

 ed tooth, distinguished from the orbit by a profound fis* 

 sure above and sinus beneath; rostrum much depressed, 

 broad at base, diminishing by a line somewhat curved, 

 to an obtuse tip, and cleft to the base; body beneath im- 

 pressed between the anterior feet; anterior feet slightly 

 verrucose, carpus without any spine, hands equal; punc- 



