56 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



obliquely downward and forward joining the inferior horizontal 

 suture. The anterior half of the side margin is marked by a row 

 of fine granules. Cardiac region and posterior part of gastric region 

 well marked. Surface finely granulate. On the front there is a 

 short shallow median sulcus, margin transverse, faintly bilobed, 

 outer corners rounded, depressed. Orbits transverse; the orbital 

 margin incloses two areas, a deep socket in which the eye fits closely, 

 and a shallow outer and inferior area. Second and third joints 

 of the antennules very long. Epistome rather deep. 



Chelipeds punctate, for the most part smooth. 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. 

 Prehensile margin of pollex denticulate and with 

 a sinus at its base forming a slight gape. Fin- 

 gers 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 are more nearly 

 Fig. 24.— chasmocau- equal than those of the male, the right or larger 



ClXrS TYPICUSj MALE , ,. ,, i (■. • i i a1 „ 



(2207:5). OUTER MA.\- resembling the leit in character, the carpus 

 ii.LiPEDs.siiowixoAP- haviug a sharp spine and the fingers very slightly 

 bent and not gaping. 



Ambulatory legs somewhat flattened, hairy ; dactyli with a fringe 

 of hair on opposite sides. 



Abdomen and sternum granulate. In the male the penultimate 

 sternal segment has a supplementary overlying plate along its pos- 

 terior margin; in the female the posterior segment overlaps con- 

 siderably the preceding. 



Measurements. — Male holotype, length of carapace 7.5, width of 

 same 9.8 mm. 



Range. — Off Trinidad and Cape Frio, Brazil. 31 to 59 fathoms. 



Material examined. — 



Off Trinidad; lat. 10° 37' 40" to 10° 37' 00" N.; long. 01° 42' 40" 

 to Gl° 44' 22" W.; 31-34 fathoms; dk. slate-col. M.; temp. C7-73° F.; 

 Feb. 3, 1884; stations 2121-2122, Albatross; 25 males and females 

 (G901). 



Off Cape Frio, Brazil; lat. 23° 08' 00" S.; long. 41° 34' 00" W.; 

 69 fathoms; bu. RL; temp. 57.1° F.; Dec. 30, 1887; station 2762, Alba- 

 tross; 3 males, 1 female (22073). 



