2 86 NATURAL HISTORY BULLETIN. 



lateral outline of each of the segments from the second to the 

 sixth inclusive, is convex; the general outline from the third 

 to the tip is triangular. 



Chelipeds punctate; merus sparsely granulate, longer than 

 wide. In the male the carpus has a tooth at the inner angle, 

 blunt in the larger or right cheliped, acute in the smaller. 

 Palms short and broad, lower margin very convex; fingers 

 very long and slender, strongly bent downward; tips acute 

 and bent toward each other. Dactylus of larger cheliped 

 shorter than the pollex and very thick at base, as seen from 

 above; prehensile margin tuberculate and very hairy. Pre- 

 hensile margin of pollex denticulate and with a sinus at its 

 base forming a slight gape. Fingers of smaller cheliped 

 slightly bent, not at all gaping, prehensile edges very finely 

 denticulate, with a larger tooth at the base of the dactylus. 

 The chelipeds of the female differ from those of the male in 

 being more nearly equal, the right or larger resembling the 

 left in character, the carpus having a sharp spine, and the 

 fingers very slightly bent and not gaping. Ambulatory legs 

 slightly flattened, hairy; dactyli with a fringe of hair on op- 

 posite sides, superior and inferior. 



Dimensions. — Male, length 7.5, width 9.8, length of pro- 

 podus of cheliped 10.5, width of same 4.2, length of pollex 

 along prehensile margin 7, of dactylus along superior margin 

 7.8 mm. 



Type locality. — North of Trinidad, 31 to 34 fathoms, sta- 

 tions 212 t and 2122, U. S. Fish Commission steamer "Alba- 

 tross" (U. S. Nat. Mus. No. 6901). 



Chasmocarcinus obliquus sp. nov. PI. vn, Fig. 6. 



( Obliquus, in allusion to the slanting eyes). 



Orbits oblique; sternum and abdomen smooth. 



Carapace narrower than in typicus, without distinct lateral 

 margin. Surface smooth, finely and obscurely punctate. Me- 

 dian notch of front shallow, but more distinct than in typicus. 

 Superior margin of orbit oblique. Eyes shorter and less ta- 

 pering than in typicus. Ridge below the orbit less prominent 

 than in typicus. Maxillipeds similar. Sternum and abdomen 



