28 
REVISTA CHILENA DE HISTORIA NATURAL 
similar to the sixth, but is only two-thirds as long, and 
has its posterior margin produced, presenting a subtrian- 
gulate aspect. 
Legs. — The first three pairs of legs are directed an- 
teriorly and are attached to the extreme superior antero- 
lateral angle of their respective segments and the last 
four, posteriorly and are attached to the extreme superior 
postlateral angle of their respective segments. The first 
gnathopods have the first joint rudimentary, the second 
joint long curved, resembling a forearm, the third is not 
quite so long, forming a sort of curved elbow, the fourth 
and fifth are shortened, stout, forming a hingejoint for 
the hand, the sixth is very stout, swollen basally tapering 
distally, with the inner margin comparatively straight 
and fringed with long pairs and set with spines. The 
seventh joint is a strong hooked finger folding over on 
the inner margin of the thumb. The second gnathopods 
are similar but decidedly weaker though longer, and have 
the dactyl distinctly bifid; the third, fourth, fifth, sixth 
and seventh legs are simlar in structure, though gradua- 
tingly increasing in length, posteriorly; eacñ has the 
dactyl distintly bifid and the inner margins of the sixth 
and fifth joints set Avith stout spines, irregularly inters- 
persed with long hairs. 
The abdomm consists of six distinct segments; the 
first four are quite short, similar, and subeq.ual, the fifth 
segment is twice as wide as the fourth segment; the tel- 
son appears dorsally as a subcrescentic segment; it is 
hidden laterally by the overlapping fifth segment and is 
produced ventrally into an extremely convex-concave 
telsen, which is strongly keeled along the median ventral 
line, widening posteriori)- and having the posterior mar- 
gin evenly rounded minutely crenulated and densely 
fringed with long, fine hairs. 
Uropoda (male): — The peduncle of uropoda resembles 
an acute angled triangle with the apex directed poste- 
riorly, and is heavily ridged along the outer margin. 
The outer branch is long, slender, concave, consists of two 
closely fused articles, a long slender and a shorter, ovate 
one; the longer (basal) article is strongly bent along the 
