52 
J. M. Thomson. 
the branchial plate, and the exopod is longer and narrower. Pleopod 4 with 
an oblong branchial plate free from setae. Exopod longer and still more 
slender than in pleopod 3, fringed with fine setae, and the second segment 
tipped with two plumose setae. Pleopod 5.A branchial plate only. 
Uropods small, conical with a few setae; inserted somewhat dorsally 
jit the posterior margin of the pleon segments. 
Male. 
Length 1-4 mm. The body is distinctly narrower than in the female; 
length two and a half times the breadth. The first four pereion segments 
are subequal in length, the first slightly shorter than the others. The first 
thoracic segment is wider than the head, the second narrower; the third and 
fourth are wider than the first. The next three segments are shorter and 
turn back at the sides as in the female. 
Pereiopod 1 similar to that of the female, equally massive, but longer. 
