532 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 94 



posterior lobe of the carapace and the free fourth segment each carry 

 a pair of dorsolateral plates. Those on the posterior lobe are sub- 

 circular in outline, inclined ventrally and have a smooth margin. 

 Those on the fourth segment are oblong with a smooth anterior margin 

 and a toothed posterior margin, which is covered by the anterior 

 shoulders of the genital segment. In the dorsal view (fig. 139) the 

 lateral projections between these two pairs of plates are the basipocls 

 of the third legs, the rami being turned inward and invisible. The 

 genital segment is half as long and two-thirds as wide as the carapace, 

 with a short and broad lobe at each posterior corner bearing on its 

 ventral surface a fifth leg tipped with five setae and extending beyond 

 the posterior margin of the lobe. The abdomen is relatively small, one- 

 sixth as wide and long as the genital segment and made up of a single 

 seg-ment. It has a posterior median sinus, which reaches beyond the 

 center, and a lobe on each side of the sinus that reaches the center of 

 the caudal ramus. The caudal rami are rodlike, four times as long 

 as wide and inclined inward, each tipped with four setae. 



The first antennae are 2-segmented, the basal segment stout and 

 covered with short spines, the end segment cylindrical, shorter than 

 the basal segment and tipped with four hairlike setae. The second 

 antenna is made up of two segments and a terminal claw. The basal 

 segment is stout and curved strongly backward with a rodlike seta 

 in the hollow of the curve and the second segment is very short and 

 unarmed. The terminal claw is curved forward giving the whole 

 appendage a pronounced S-curve and carries an accessory spine on 

 its outer margin near the base. The second maxilla is 3-segmented, 

 the basal segment unarmed, the second segment with spines and a 

 knob at its distal end, the terminal segment flattened with a corru- 

 gated margin, a curved spine at the tif) and a row of acicular spines 

 along the central surface. The maxilliped has a stout basal segment 

 and a strong curved claw with a small spine on its inner margin near 

 the base. The four pairs of legs are all biramose and the rami are 2- 

 segmented, with the spines and setae arranged as follows: First en- 

 dopod 0-0:1-3, exopod 1-0:4-3; second endopod 1-1:1-8, exopod 

 1-1 : 4r-6 ; third endopod 1-1 : 0-6 ; exopod 1-1 : 3-G ; fourth endopod 

 1-0 : 5-0 ; exopod 6-0 : 9-0. In the first and fourth legs the endopods 

 are two-thirds as long as the exopods ; in the other two pairs of legs 

 the rami are equal. Total length, 6 mm. Carapace, 3.7 mm. long. 



Remarks. — The discovery of a female confirms the validity of the 

 genus and since the original generic diagnosis was based upon males 

 only we may add the following from these females: Carapace and 

 free segment like those of the male but with a pair of small dorsal 

 plates on the third and fourth segments. Genital segment large, 

 more than half the size of the carapace; abdomen 1-segmented, at- 



