302 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
with small triangular spines at the posterior corners. Urosome one- 
fourth as long as the metasome and one-third as wide; 3-segmented. 
Genital segment rectangular, one-half longer than the two abdominal 
segments combined, with a rounded process on each side near the 
base and a conical process near the center of the ventral surface. 
Brady’s figure (1883, pl. 38, fig. 14) gives the idea that the lateral 
processes are below the level of the dorsal surface of the segment, but 
he says nothing about it in the text. In reality they are flush with 
the dorsal surface and extend only a short distance down on the 
lateral surface. The left process is a little larger than the right and 
nearer the base of the segment, and each is joined to the segment by 
a narrow neck. The abdomen is 2-segmented, the two segments being 
about the same length, but the anal segment is cut nearly to its base 
by a triangular anal sinus. The caudal rami are somewhat divergent, 
enlarged distally, and more than twice as long as wide, with a fringe 
of hairs on their inner margins. 
The first antennae reach only to the center of the third thoracic 
segment ; the exopod of the second antenna is shorter than the endopod 
and 5-segmented, with four setae. The chewing blade of the mandible 
is considerably widened distally and armed at the outer corner with 
two large blunt teeth tipped with minute spines, and separated by a 
wide and deep sinus. Then come two medium blunt teeth, tipped 
with minute spines, close together, and three small sharp teeth at the 
inner corner with a seta on the lateral margin. The first maxilla is 
almost exactly like that of Pontella lobiancoi as figured by Giesbrecht. 
The maxilliped is 7-segmented, the second segment as long as the first 
and armed with five processes on the inner margin carrying setae. 
The five distal segments combined are no longer than the second seg- 
ment and each carries two setae on its inner margin. The exopods 
of the first four pairs of legs are 3-segmented; the end segment with 
two spines on the outer margin, one at the distal corner and a termi- 
nal spine as long as the segment itself, with an outer serrate flange. 
The endopods reach the distal end of the second exopod segment, the 
first endopod 3-segmented, the others 2-segmented. Each fifth leg is 
biramose, the rami 1-segmented, the exopod three times as long as the 
endopod, with three small spines on its outer margin and two at the 
tip. The endopod is acuminate, unarmed, and undivided. Total 
length 3.20 mm. 
Male-—Metasome elliptical and not narrowed at either end; head 
broadly rounded in front and without the spine shown in Brady’s 
figure. Fourth and fifth segments completely fused and smoothly 
rounded at the posterior corners. Urosome made up of four segments 
of about the same length and width, the anal segment without a pos- 
terior sinus. Caudal rami elongate, divergent, not enlarged distally, 
and three times as Jong as wide. 
