100 Notes on North Kmerican Crustacea^ 



It is distinct from all other known species with the carapax 

 broader than long, in the shortness of its chelipeds. In one of 

 the specimens before me the right hand is nearly twice as broad 

 as the left. 



Two specimens were collected at Manzanillo, Mex., by Jolui 

 Xantus, Esq. 



liniiibriis liypoiien!^, nov. sp. 



The carapax is subrliomboidal in shape, the posterior region being 

 well developed and prominent, as in L. angulifrons. There is one low 

 tvibercle on the gastric region, two lai-ge, prominent ones on the 

 cardiac, one small, spiniform one on the posterior margin at the 

 median line, and two rather large ones on the branchial region, the 

 posterior one of which is the taller, and situated close to the postero- 

 lateral margin. Besides these tubercles, there are several other, minute 

 ones, roughly arranged in eight or ten longitudinal rows, and the gen- 

 eral surface is covered with ptmctures, crowded together. There are 

 two or three small pits in the depression between the branchial and 

 gastric regions. The antero-lateral margin behind the cervical sulcus 

 is armed with eight triangular, denticulated teeth, the posterior one 

 being but little longer than the others, which are equal in size. Front 

 smooth. Rostrum of moderate size, subtriangular, deflexed ; sides 

 slightly concave, unarmed ; apex obtuse. Chelipeds long ; surface 

 smooth above, except that of the meros, which has a median tubercu- 

 lated ridge ; edges of meros, carpus, and hand armed with small teeth, 

 ' which, on the supei'ior edge of the meros, are spiniform ; oiiter edge 

 of hand with sixteen teeth alternating in size. Below, the chelipeds 

 are smooth and glabrous except the inner edges, which are tubercu- 

 lated ; the tubercles being small. Sternum with a strongly prominent, 

 almost capitate tubercle on each side at the base of the chelipeds, 

 which also bears a small tubercle on the basal joint ; these four tuber- 

 cles are somewhat flattened at the top and bent forward. In the fe- 

 male abdomen the segments are each armed with a transverse I'idge, 

 more or less developed; on the second and third joints this ridge is 

 strongly toothed, and on the j)enult joint it a])pears in the form of a 

 median tubercle. 



