xo. 2067. NEW SPECIES OF GRABS— RATHBUN. 149 



flattened, oblong, with pronounced inner and outer margins, and 

 not reaching as far as the finger, the inner margin ending distally 

 in a prominent angle rounded off, the outer margin ending in a stout, 

 blunt, outward-pointing spine; inner surface of palm rising in an 

 obliquely-longitudinal crest through the middle; the inner margin 

 of the upper surface ends proximally in a tubercle; surface finely 

 granulous; upper surface also rugose; lower margins and inner crest 

 tuberculous; fingers meeting throughout, finely toothed, outer mar- 

 gins fringed with hair. When the smaller cheliped is flexed there 

 is formed on the lower side a small hole bounded by the ischium, 

 merus, and propodus; it is probable that this hole serves as a pas- 

 sage for water into the left afferent branchial canal. The gape 

 between the fingers of the larger cheliped forms, when that member 

 is flexed, an oval area fringed with hair, widening toward the body 

 by the peculiar slope of the immovable finger, and situated directly 

 over the orifice of the right branchial canal. 



The narrow legs are pubescent and the last three joints fringed 

 with hair. 



Between the fourth and fifth segments of the sternum a narrow 

 plate is intercalated; this character is generic. In this species the 

 plate covers the genital canal leading from the coxa. The abdomen 

 is small, first segment almost concealed under carapace, third to 

 fifth segments partially fused, third to seventh segments subtrian- 

 gular, seventh segment oblong. 



This species differs from H. lugubris * in its constricted eyestalks, 

 in the produced outer angle of the merognath, in the arching dactylus 

 and deflexed immovable finger of the large cheliped, and the flat 

 lower surface of the small cheliped. 



CHASMOCARCINUS CAVIMANUS, new species. 



Type-locality. — Tanon Strait, east coast of Negros: Pescador 

 Island, N. 72° E., 3.3 miles; lat. 9° 56' 30" N.; long. 123° 15' E.; 

 300 fathoms; gn. m.; temperature 62.8° F.; April 1, 1908; station 

 5189, Albatross; one male. 



Type.— Cat. No. 46413, U.S.N.M. 



Dimensions. — Type male, length of carapace, 11.6 mm.; width of 

 same, 14.4 mm.; fronto-orbital width, 7 mm.; front, 3.3 mm. 



The carapace is loosely covered by a short, thin pubescence the 

 removal of which discloses coarse punctse and fine granules ; the latter 

 are especially abundant on the median regions and near the margins. 

 The longitudinal depressions at the inner angles of the branchial 

 regions are very deep. The carapace is widest a little in front of the 

 postero-lateral angles; middle third of posterior margin transverse; 

 upper margin of orbit transverse; front with sides slightly convergent 



i Alcock, Journ. Asiatic Soc. Bengal, vol. 69, 1900, p. 327, and synonymy. 



