Rev. A. M. Norman on Crustacea Cumacea. 71 
seven spines on the hinder margin of the first joint; the last 
three joints gradually decrease in length ; and the limb does not 
reach beyond the extremity of the rostrum. Telson rudi¬ 
mentary. Uropod with a peduncle not exceeding in length 
the 5th segment of the pleon, bearing three spinules on the 
inner margin ; inner branch much shorter than the outer, 
1st joint with five spines, of which the distal is much the 
largest, on the inner margin ; second joint with five spines, 
which gradually increase in length distally, on the inner 
margin, one distal spine on the outer margin, and a terminal 
spine, which is two thirds as long as the joint from which it 
springs ; outer branch having the first joint short and un¬ 
armed, the second very long, with two or three minute set® 
on the outer margin, and long setae on the distal portion of 
the inner margin and at the apex. Length 6 millims. 
One specimen taken in the 1 Valorous ’ expedition at the 
entrance of Davis Strait, Station 9, lat. 59° 10' N., long. 
50° 25' W., in 1750 fathoms. 
4. Leucon brevirostris , n. sp. 
Female. Cephalothorax equal in length to five segments of 
pleon. Carapace longer than the free segments, ovate, deep, 
gently arched above, compressed; infero-anteal angle greatly 
produced and terminating in a sharp point, with five serra¬ 
tions ; rostrum unusually short, broad, rounded, minutely 
serrated on the edge ; dorsal line toothed more or less 
throughout, but the teeth separated by intervals posteriorly, 
where they are small, increasing in size and closeness to each 
other in front, about twenty in all ; the teeth are not regu¬ 
larly arranged, as usual, in single file, but in an irregular 
double alternating line ; surface everywhere ornamented with 
very pretty and regular hexagonal celled structure ; carapace, 
seen from above, widest behind the middle, gradually and 
evenly narrowed thence to the extremity of the rostrum. 
Third maxilliped with the first joint strongly spined, the four 
or five more distal spines of great size and thorn-like form, 
the lobe of this joint greatly developed, reaching forward to 
the end of the third joint, and its long set® extending to the 
end of the penultimate joint ; second joint armed with one 
spine, similar in character to those of first joint. Telson very 
short, semiovate, smooth. Uropods with peduncle slightly 
longer than the fifth segment of the pleon, having five long 
spines on the inner margin ; inner branch with first joint 
longer than the second, having ten spines of unequal length 
on the inner margin ; second joint with five spines on the 
inner margin and two longer at the extremity ; outer branch 
