542 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ai 



projections at their posterior corners. The caudal rami are wider 

 than long with a finger projection at each distal corner and three 

 setae diminishing in length outward, the inner one being nearly 

 twice the length of the urosome. The eggs are carried in a single 

 ovisac, which is considerably larger than the entire urosome. 



The first antennae are 9-segmented, the second segment much longer 

 than any of the others, all the segments well armed with setae. The 

 second antennae are 3-segmented, the terminal segment longer than 

 either of the others, the exopod very small and indistinctly segmented. 

 The mandibular palp is biramose, the rami of about equal length and 

 heavily armed with setae. The maxilliped is tipped with a strong 

 chela. The first four pairs of legs are biramose, the rami 3-segmented. 

 In the first legs the endopod is considerably longer than the exopod 

 and the basal segment much longer than the two distal segments 

 combined. The second segment has a stout curved spine on its inner 

 margin and the end segment has two stout claws turned outward. 

 The basal segment of the exopod has a large outer seta, the second 

 segment has a seta at each distal corner, the outer one enlarged at 

 its base. The end segment has three outer, two terminal, and one 

 inner seta, the outer ones with enlarged bases. In the second, third, 

 and fourth legs the arrangement of the setae is shown in figures 215- 

 217. The exopods of the fourth legs reach beyond the tips of the 

 caudal rami and the last two segments are visible in dorsal view 

 behind the dorsal epimeral plates and outside the genital segment. 

 The fifth legs are uniramose and 2-segmented, the segments of equal 

 length and setose, the terminal one fringed with hairs on its outer 

 margin. Total length, 1.35 mm. Width of carapace, 0.825 mm. 



Male. — Body relatively wider and shorter than in the female ; cara- 

 pace three-tenths wider than long. The dorsal epimeral platesf 

 diminishing in width more rapidly backward but increasing in length 

 so that the posterior margin of the third plate reaches behind the 

 center of the genital segment. The posterior corners of the carapace 

 and the epimeral plates are longer and more acute than in the female. 

 The urosome is relatively shorter and wider, the caudal rami are 

 considerably wider than long, with the inner terminal seta more than 

 twice as long as the urosome. 



The first antennae are 6-segmented and geniculate, the end section 

 made up of two segments, the basal of four segments, of which the 

 second is the shortest and the third the longest. In the end section 

 the terminal segment is three times as long as the penultimate seg- 

 ment. The second antennae, mouth parts, and first four pairs of legs 

 are like those of the female. The fifth legs are 2-segmented but the 

 basal segment is one-half longer than the distal segment and is armed 

 with a long and stout spine at its distal inner corner. Total length, 

 1.20 mm. Width of carapace, 0.85 mm. 



