1886.] DURING THE VOYAGE OF H.M.S. ‘CHALLENGER.’ 115 
of the thorax ; it terminates in the middle line anteriorly in a sharp 
rostral prolongation. The free thoracic segments increase in length, 
but decrease in width up to the fourth, but there is less difference 
between the first three than between the third and fourth; the 
fourth and fifth segments are subequal ; the sixth is shorter, but not 
perceptibly narrower than the fifth ; in the first segment the epimera 
are prolonged into a spine; on the fourth and fifth segments are two 
knob-like projections on either side, equidistant from each other, and 
from the epimeron; on the terminal segment there is a single 
process; the five anterior abdominal segments are subequal, and 
furnished laterally with sharp spiny epimera. The caudal shield is 
hourglass-shaped, being constricted in the middle, it narrows rapidly 
to the obtusely pointed extremity. The outer flagellum of the 
antennules has eight joints, the inner only three. ‘The uropoda are 
extremely elongated ; the endopodite has two joints, the exopodite 
six. 
Kerguelen ; 120 fathoms. 
TYPHLAPSEUDES, nov. gen. 
This genus is distinguished from Apseudes by the almost complete 
disappearance of the ocular lobes, which are represented by a small 
triangular process without any trace of ocular structures; by the 
absence of an exopodite to the chelipeds and fossorial limbs; and by 
the fact that the exopodite of the abdominal appendage is distinctly bi- 
articulate. In the last character this genus agrees with Sphyrapus. 
1. TyPHLAPSEUDES NEREUS, 0. Sp. 
This species attains to a length of about 10 millim. The body is 
somewhat flattened and depressed, very much wider anteriorly than 
posteriorly ; the cephalothorax terminates in front in a sharp rostrum; 
to the outside of the antennules is the triangular pointed ocular lobe, 
which contains no optic structures; some way below this is a 
pointed lateral process. The free thoracic segments diminish in 
breadth, but increase in length up to the fifth; the sixth is narrower 
but shorter than the fifth; the epimera of the first thoracic segment 
project as a spiny process; the lateral margins of all but the first 
two segments are furnished with a short spine placed halfway 
between the epimera and the anterior margin of the segment ; 
on the ventral median line of the thoracic segments is a spiny 
process ; similar minute spines exist upon the abdominal segments. 
The abdominal segments with the exception of the last are furnished 
with small pointed epimera; the last segment is as long as four 
of the anterior segments, it terminates in a straight truncated 
extremity, in the middle of which is a short knob-like process. 
The antenne have a rudimentary exopodite. The chelipeds and 
fossorial limbs are normal in structure, but possess no exopodite. 
The uropoda are extremely long, as in Apseudes. 
Station 23; 450 fathoms. 
8? 
