CRUSTACEA FROM THE FALKLAND ISLANDS, 361 
joint, though well pronounced, is very slender and does not 
reach the palm. In the second pair the process of the same 
joint, instead of being very long and extending beyond the inner 
corner of the palm, is very short and quite distant from the palm. 
Moreover, the first antenna in the female is decidedly shorter 
instead of a little longer than the second, and it has a flagellum 
as long as the peduncle instead of one only a little longer than 
the peduncle’s third joint. Here, it may be theught, are materials 
for establishing a new genus, but that may wait, since the 
discovery of intermediate forms might easily make it unnecessary. 
The organ of vision on the short rostrum is white in the pre- 
served specimens. ‘The first antenne have the first joint as long 
as the second and much stouter, the third joint little more than 
two thirds as long as the second, the flagellum of sixteen joints. 
In the second antenne the last joint of the peduncle is longer 
than the stouter penultimate; the gland-cone of the second joint 
is blunt-ended ; the flagellum is composed of twenty-two joints, 
but fewer in a smaller specimen. 
The trunk of the mandibles has the cutting-edge not strongly 
dentate, the molar not very prominent, the third joint of the 
palp much shorter than the setose second, each curved but in 
opposite directions. ‘The spine-row consists of five spines. The 
inner plates of the lower lip are distinctly developed. The inner 
plate of the first maxille is tipped with three small sete; the 
elongate second joint of the palp has several sete along the 
outer margin and six spines on the distal part of the inner. The 
maxillipeds are like those in the type species. 
The oblique palm is longer than the hind margin of the hand 
in the first gnathopod, but considerably shorter than it in the 
second. The first and second perzopods are alike. The third 
and fourth differ from them in the greater expansion of the 
second joint. The fourth differs from the third by the greater 
size of its second, fifth, and sixth joints. In all four pairs the 
sixth joint is notable for the dense clothing of sete along the 
back or convex margin of the sixth joint. The small finger is 
unarmed except for a microscopic unguis. The long fifth perzo- 
pods do not appear to be distinctive. 
The pleopods have two minute coupling-hooks on the inner 
distal corner of the peduncle, and five coupling-spines on the 
first joint of the inner ramus, which is very slightly shorter than 
the outer. The uropods have their long peduncles successively 
shorter, in each case longer than their respective rami, which 
are also long, in the first and second pairs the inner ramus 
slightly longer than the outer, the spine armature throughout 
rather slight. The telson scarcely longer than broad, with a 
minute spinule at each rounded corner of the truncate distal 
margin. 
The female specimen measured 9 mm. across the curve from 
the rostrum to the end of the third pleon segment, so that if 
straightened out the full length to the end of the telson might 
