642 PROCEEDI^^GS OF THE NATIONAL MUSEUM. 



numbered 43572, U.S.N.M. The remaming specimens are numbered 

 43576, U.S.N.M., and become paratypes. 



Specific characters of female. — Cephalo thorax short and wide and 

 separated from the body by a well defined groove, the anterior por- 

 tion covered with a dorsal carapace; trunk pear-shaped, naiTowed 

 anteriorly into a long slender neck, prolonged posteriorly into a 

 bluntly rounded point between the egg strings, which represents the 

 abdomen; on either side of this point, and dorsal to the egg strings, 

 is a short cylindrical process, half a millimeter long and curved like a 

 parenthesis mark; they are of the same diameter throughout, with a 

 slight constriction at the base; egg strings only one-third as long as 

 the trunk, but plump; eggs large, in 4 or 5 longitudinal rows, about 

 10 in each row. 



First antennae plump and almost entirely concealed by the second 

 pair, indistinctly jointed and terminated by three short spines. Sec- 

 ond antennae large and stout, inclined inward against the mouth 

 tube, and biramose at the tip, the two rami well separated, unseg- 

 mented, and curved toward each other at their tips, each armed with 

 one or two stout spines and many smaller ones. First maxillae slender 

 and tipped with two setae; palp short and thick, and also tipped 

 with two setae. Second maxillae about twice the length of the 

 cephalo thorax, slender and joined at the tip to a small, button- 

 shaped bulla. Maxillipeds large and stout, the terminal claw long 

 and slender, w^ith an accessory claw on the inner margin, close to the 

 tip, followed by a row of saw teeth; a large roughened knob on the 

 inner margin of the basal joint near the distal end, against which the 

 terminal claw shuts. Color, a uniform creamy white, the bulla 

 transparent. Total length, including posterior processes, 5 mm. 

 Length of cephalo thorax, 1.2 mm.; of egg strings, 1.75 mm.; of sec- 

 ond maxillae, 3 mm. Greatest width of trunk, 1 mm. 



Specific characters of male. — Anterior portion of cephalothorax and 

 trunk parallel with each other and with the second maxillae and at 

 right angles to the posterior portion of the cephalothorax; no cara- 

 pace; trunk conical, tapering rapidly backward, unsegmented, ter- 

 minating in two short processes, each tipped with a single spine; in 

 side view the trunk does not project beyond the maxillipeds and 

 looks like a thnd pair of appendages. 



First antennae three-jointed; second pair biramose, the rami 

 curved toward each other, and each armed with two stout spines. 

 First maxillae swollen at the base, slender at the tip, terminating in 

 two long setae; no palp; second maxillae slender and tipped with a 

 stout claw, which shuts past a spine on the basal joint, forming a 

 chela. Basal joints of maxillipeds stout, almost squarely truncated 

 at the distal end, and furnished there with a short and strong claw 

 whose tip shuts down into a gi'oove between two rounded knobs. 



Color, a uniform creamy-white. 



