no. 2067. NEW SPECIES OF CRABS— RATHBUN. 151 



Subfamily TYPHLOCARCINOPSIN^]. 

 TYPHLOCARCINOPS DECRESCENS, new species. 



Type-locality. — Tawi Tawi Group, Sulu Archipelego : Tinakta Island 

 (E.), N. 12° W., 1.8 miles; lat. 5° 10' 15" N.; long. 119° 53' E.; 16 

 fathoms; fne. s., blk. sp.; February 22, 1908; station 5161, Alba- 

 tross; four males, two females (one male is type). 



Type.— Cut. No. 46407, U.S.N.M. 



Dimensions. — Type male; length of carapace, 8.2 mm.; width of 

 same, 10. 1 mm.; width across front and orbits, 4.6 mm.; width of 

 front, 2.3 mm.; length of third leg, 17.5 mm. 



The surface is almost entirely pubescent except the outer side of the 

 larger palm of the male, and the margins are fringed with hair. Cara- 

 pace strongly bent downward anteriorly, nearly level from side to 

 side, widest near the middle, postero-lateral margins sinuous, but 

 with a general longitudinal direction, posterior margin convex. 

 Beginning a little behind the orbit the margin is acute and soon forms 

 a narrow crest which terminates at the middle of the postero-lateral 

 margin; three shallow notches form as many slight teeth or lobes; 

 surface near the margin sparingly granulate; these features are not 

 visible until the hair is removed. Cardiac and posterior mesogastric 

 region well-defined. The eyes fill the oval orbits but do not project 

 beyond the general curve of the carapace; the cornea is pale and ter- 

 minal. The front is widest just above the antennas and is constricted 

 behind that point, its anterior edge is arcuate and bilobed; a dorsal 

 median furrow. 



The epistome is short and its posterior edge is strongly arched for- 

 ward either side of the middle. Sides of buccal cavity parallel; when 

 the maxillipeds are in place they do not touch each other; merognath 

 subquadrate, its antero-external angle obtuse but well-defined. 



Chelipeds very unequal in the male ; merus unarmed ; carpus angled 

 but not dentate on the inner side, sparingly granulate along the inner 

 distal margin; propodus high, smooth, lower margin subacute, set off 

 on the immovable finger by a deep groove; prehensile edges of fingers 

 furnished with low teeth or lobes; the fingers gape narrowly and cross 

 at the tips; in alcohol they are light horn-color. In the female the 

 chelipeds are nearly equal, both are covered with pubescence, and 

 the fingers nearly meet. 



Although the length of the legs is represented by 3.2.1.4, the third 

 being the longest and the fourth the shortest, yet their dactyli diminish 

 notably in length from the first to the fourth pair, a fact to which the 

 specific name draws attention. 



The second and third segments of the abdomen have their lateral 

 margins angled; the fourth to seventh segments taken together are 



