50 
T. y. HODGSON. 
it seems to resemble Jseropsis Koehler more closely than any other, though the structure 
of the second antenna and the uropoda should exclude it from the Janiridse as at 
present defined. 
Austronanus glacialis. 
(Plate VIII., fig. 3.) 
Specific characters :— 
Cephalosome broad, rather pointed anteriorly. 
Second antenna, second joint produced externally as a flattened blade. 
Urosome with ten recurved teeth in front of the preterminal uropoda. 
This is the most diminutive species in the whole collection, and is of ovoid form. 
The cephalosome is large, with the lateral projections which carry the eyes 
scarcely as broad as the first segment of the mesosome. The ocular projections are 
very stout though not very long, their angles are rounded, and the eyes, which are 
red in colour, are quite small. Anteriorly the cephalosome is arched forwards in 
rather a pointed manner, and its anterior border is flattened. In length it is equal 
to that of the first two segments of the mesosome. 
Of the mesosome the first two segments are subequal in length, the first is 
curved forwards, the second is the widest, and, with the third, straight; the remainder 
progressively decrease in length and in width, all of them being more or less curved 
in a backward direction. The epimera, not separable from the body, are almost the 
full length of their respective segments, with rounded angles, and a distinct space 
between each segment; there is no “ waist” between the fourth and fifth segments. 
The metasome comprises only a single plate, the urosome. This is slightly 
wider than the last segment of the mesosome and attached to it alone; half its width. 
The external margins, as far as the insertion of the small uropoda, are rounded and 
armed with ten fiat curved teeth, which increase in size as far as these appendages; 
between the uropoda there projects a rounded lobe. 
The uropoda are short, single-jointed stumps, setose at the extremity. 
The first antenna is short, and has a peduncle of two short joints and a flagellum 
of five. 
The second antenna has a peduncle of five joints ; of these the first is small, 
the second is large and much dilated externally, the third is short, the fourth twice 
as long, and the fifth rather more than the length of the two preceding. The 
flagellum only contains about seven joints, and is scarcely twice as long as the last 
joint of the peduncle. 
The mouth organs cannot be detected without dissection, and this has not been 
done as there is but a single specimen. 
The first of the pereipoda is stout and a little shorter than the others. The basis 
and ischium are two stout joints, the latter not so long as the former, but details 
cannot be seen without removal from the body. The merus is short and enlarged 
dorsally in a rounded manner, overreaching the base of the carpus. The carpus is 
