1886.] DURING THE VOYAGE OF H.M.S. ‘CHALLENGER.’ 117 
with fine hairs. The uropoda are uniramous and consist of twelve 
joints. 
Off Prince Edward’s Island ; 50-150 fathoms. 
Genus TypaHiotanats, G. O. Sars. 
1. TYPHLOTANAIS KERGUELENENSIS, 0. sp. 
The individuals of this species measure up to 3 millim. in length. 
The cephalothorax is short and wide; it is prolonged between the 
antennz into a short pointed triangular process ; eyes completely 
aborted. The first segment of the thorax is shorter than the rest 
which are subequal, diminishing slightly towards the posterior 
extremity of the body ; the first segment has a compressed forwardly- 
directed spine arising from the median ventral surface ; there is a 
trace of a similar process on the second segment. The first pair of 
thoracic appendages arise close to the anterior border of their 
segment, the second pair further back, the third pair from about 
the middle of the segment; the three posterior pairs of thoracic 
appendages arise close to the posterior boundary of their segments. 
The antennules are about as long as the cephalothorax. The 
chelipeds are rather slender. The wropoda are biramose, the outer 
ramus one-jointed, the inner two-jointed. 
Kerguelen, Christmas Harbour ; 120 fathoms. 
2. TYPHLOTANAIS BRACHYURUS, 0. sp. 
The length of this species is 8 millim. The cephalothorax is hardly 
longer than the first free thoracic segment; the first thoracic segment 
is one third less than either of the two following, which are sub- 
equal; the fourth segment is hardly shorter than the third, the fifth 
and sixth decrease progressively. The first pair of appendages is 
attached close to the anterior border of the segment; the two following 
pairs are moved a little way back, but are still quite close to the 
anterior extremity of their segments; the three posterior pairs are 
attached close to the posterior border of their segments. There is 
no ventral spine on the first free segment. The abdomen is short, 
and not so long as the last two segments of the thorax. The 
antennules are rather shorter than the cephalothorax. The chelipeds 
are short and stout. As in the last species, the three following pairs 
of appendages are more slender than the three posterior pairs. The 
uropoda are as in the last species. 
Station 246 ; 2050 fathoms. 
NEOTANAIS, noy. gen. 
This genus comes nearest to Heterotanais, but differs in the great 
length of the endopodite of the uropoda, and in the fact that the 
chel are fully developed and of the normal structure in the male ; 
a well-marked character of this genus is the specialization of the 
thoracic appendages into an anterior and posterior series; in the 
first three pairs the distal joint of the limbis a single, somewhat curved 
