458 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



from spiracle of a sting ray, August 15, 1923; two females from 

 spiracle of sting ray, July 7, 1926. The female with attached male 

 is made the species holotype, with U.S.N.M. No. 56644. 



Color. — Body a uniform grayish white; egg strings brownish. 



Feriwle. — Carapace triangular with rounded corners, the apex 

 forming the frontal margin between the bases of the first antennae, 

 the base of the triangle forming the posterior margin and showing 

 neither lobes nor sinuses nor stylifoiTn processes. The width, great- 

 est near the posterior margin, and the length of the carapace are 

 about equal. The cephalic area is triangular, the apex of the tri- 

 angle at the center of the carapace. The second, third, and fourth 

 segments are about the same length, and a little more than half as 

 wide as the carapace ; their lateral margins are strongly convex, and 

 there are no indications on their dorsal surfaces of the paired dorsal 

 plates found in Kr0yeria. The fused fifth and genital segment is 

 nearly as wide as the carapace and about three and a half times as 

 long as wide; the egg strings attached to its posterior corners con- 

 tain 18 eggs each, which are proportionately larger in diameter and 

 much thicker than in Kr^yeria. The abdomen is 2-segmented, the 

 anal segment nearly twice the length of the basal segment; caudal 

 rami four times as long as wide, each with three short apical setae. 



The first antenna is filiform and 6-segmented, the first, third, and 

 sixth segments much longer than the other three, the second and 

 sixth segments with setae, the others wdth spines only. Second 

 antenna as long as the first and standing out prominently from 

 the ventral surface of the head. The terminal chela is quite 

 different from that found in Kr^yeria; there a curved and movable 

 dactylus shut down into the hollowed tip of a fixed finger and the 

 bases of the two digits were widely separated. Here apparently 

 both digits are movable and their bases are in contact; they more 

 resemble a pair of parallel pliers than a chela. The second maxillae 

 are 3-segmented, the basal segment stout, the second segment slender, 

 the terminal segment in the form of a triangular claw. The distal 

 end and the outer margin of the second segment are armed with long 

 cilia, and the outer margin of the claw has a fringe of long spines. 

 In the maxillipeds the basal segment is much swollen on its inner 

 margin ; the terminal claw is as long as the basal segment and shuts 

 down over this swelling. The spines on the outer and the setae on 

 the inner margins of the three segments in the rami of the swimming 

 legs are arranged as follows: First exopod, 1-1, 1-1, 2-4; first endo- 

 pod, 0-1, 1-1, 0-6; second exopod, 1-1, 1-1, 3-4; second endopod, 

 0-1, 0-1, 1-5; third exopod, 1-1, 1-1, 3-4; third endopod, 0-1, 0-1, 

 1-4; fourth exopod, 1-1, 1-1, 3-4; fourth endopod, 0-1, 0-1, 1-3. In 

 the terminal endopod segment of the second, third, and fourth legs 



