636 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



other. Each branch is slender, conical, and rather blunt, without 

 flanges or wings of any sort. 



Between the bases of these maxillae and those of the second antennae 

 there is on either side a pair of conical papillae. The larger of these 

 is in a line between the two appendages mentioned, and is furnished 

 with a stout spine which is inclined strongly backward. The other 

 smaller papilla, which is without a spine, joins the larger one on its 

 outer border. These evidently represent the rudiments of the endopod 

 of the second maxillae. The first maxillipeds are slender, the terminal 

 joint nearly twice the length of the basal and ending in three long- 

 setae, the inner' two of which are pectinate. The second maxillipeds 

 are stouter, with the terminal claw nearly as long as the basal joint and 

 acuminate; the accessory spine is long and slender. Furca short and 

 very wide, the branches longer than the base, widely separated, and 

 nearly parallel, with the intervening sinus but little rounded. The 

 branches are short and blunt with a slight flange on the inner side, 

 making them widest at the center. 



The first swimming legs are short and stout, the basal joints con- 

 nected across the median line by a narrow band of chitin, and each of 

 them armed posteriorly with a short, blunt spine. The second joints 

 are fringed with hairs posteriorly and carry a single small spine at the 

 distal end anterior^. The three terminal claws decrease in size pos- 

 teriorly, the third one being only half as long as the first. The seta 

 at the distal corner is very small, being no longer than the shortest 

 claw. The second pair of legs are also stout, the basal joints being 

 nearly circular in outline and densely fringed with hairs around their 

 entire margin. The basal joint of the exopod is noticeably long, and 

 the spines are slender and sharp. The rami of the third legs are large 

 and close together, the spine at the base of 'the exopod being twisted 

 until it is nearly parallel with the margin of the basal apron. The 

 fourth legs are large and reach back considerably beyond the posterior 

 margin of the genital segment; they are four-jointed, the basal and 

 third joints carrying spines at their distal ends, and the terminal joint 

 ending in three short spines of about equal length. The fifth legs are 

 well defined and their setae show beyond the edge of the genital 

 segment. 



Total length 7 mm. Length of carapace 4 mm.; width of same 3.25 

 mm. ; length of genital segment 2.1 mm. ; length of abdomen 0.5 mm.; 

 length of Qgg strings 6.3 mm. 



Color a uniform light yellowish white. 



{jxirviventris, parvus, small, and venter, the abdomen.) 



Male. — Carapace elliptical, one-eighth longer than wide, the posterior 

 sinuses very broadly triangular, leaving a well-rounded median lobe 

 and lateral lobes, which flare outward. 



Free thoracic segment considerably narrower than the genital seg- 



