18G9.] 285 [Smith. 



ened and with a ridge extending back upon the carapax. In some 

 young sjjecimens the tips of tlie teeth are sliglitly hooked forward, 

 inferior lateral regions finely granulate. Inferior margin of the orbit 

 not broken by a notch, but the inner angle rather abruptly projecting 

 as an obtusely triangular tooth. External hiatus of the orbit a small 

 and very narrow incision. 



Chelipeds unequal (either the right or left being the larger), carpi 

 and hands smooth or shghtly rugose above; larger hand very stout, 

 the fingers short and thick, obtusely toothed within, and without a 

 strong basal tooth on the dactylus. Ambulatory feet somewhat pu- 

 bescent, all the dactyli long and slender. Terminal segment of tlie 

 male abdomen broader than the penult, about two-thirds as long as 

 broad, the side slightly concave and the tip abruptly triangular. Fin- 

 gers black, the tips lighter and the black spreading broadly upon the 

 palm. 



Length of carapax in a male from New Haven, 18.8 miUim. ; 

 breadth, 25.2 millim. ; ratio, 1:1.34. Length of carapax in a male 

 from Cape Cod, 19.2 millim.; breadth, 25.2 millim., ratio, 1:1.31. 



New Haven, Conn., in the same localities with the last species 

 and in about equal abundance. Eastham, Cape Cod; W. C. Fish 

 (Collection of the Essex Institute). 



This species is easily distinguished from P. depressus by its nar- 

 rower and much more convex and swollen cara23ax, the projecting 

 and ai'cuate front, the more abruptly projecting iimer angle of the 

 inferior margin of the orbit, and by the very different form of the 

 terminal segment of the male abdomen. The teeth of the antero- 

 lateral margin are also quite ditrcrent. In some respects it agrees 

 with Stimpson's description of P. iexanus (Annals Lye. Nat. Hist. 

 N. y., Vol. VII, p. 55, 1859) and it may possibly prove to be that 

 species, but over one hundred specimens examined agree in having 

 the fingers black, the left hand frequently the larger and the first 

 second normal teeth of the antero-lateral border coalescing. 



Pilumnus limosus, sp. nov. 



Body and feet covered with a light brown, velvet-like pubescence 

 composed of short clavate hairs, among which the tubercles and gran- 

 ules appear as little depressed pits in the general surface. Carapax 

 strongly dellexed in front but much flattened jiosteriorly, distinctly 

 areolated, and ornamented above with about forty, scattered, smaU tu- 

 bercles or granules, of which fourteen of the larger ones are on the gas- 

 tric region, two being on each of the anterior lobes, three on each of 



