24 T. V. HODGSON. 
bears two teeth separated by a rounded recess. Close to this rises a ridge on each 
side, which runs outwardly to end in a stout spine above the point of insertion of the 
uropoda. The cephalosome is about one-fifth the length of the body, it is separated 
off from the epimera of the first thoracic segment by a very distinct groove, which 
passes forward in a slightly curved line just outside the eyes. The anterior margin is 
bevelled to receive the first antenna, and presents three crescentic depressions, of which 
the median one is the largest, and further subdivided by a small median tubercle 
between the antenne. A median plate with rounded angles lies between the eyes 
anteriorly, and behind it most of the space is raised into two irregular and flattened 
enlargements with their posterior margins rounded, a median lobe on each side being 
conspicuous. 
Between and behind these enlargements is a narrow plate with a small dark 
tubercle in the centre. The eyes are prominent, large; except anteriorly they are 
separated off from the two tuberculated enlargements alluded to above by a deep 
groove. The cornea is oblong, lunulate, and composed of a large number of small 
facets. The first thoracic segment is separated from the second by a line- of 
segmentation, distinct enough at its origin, but which dies away before it reaches the 
margin. The anterior margin of these two thoracic segments, like that of all the 
epimera, is minutely serrate. The last thoracic segment is invisible from the dorsum, 
and the first abdominal, which is without epimera, is enclosed by the arching forwards 
of the seventh thoracic. Only on the third, fourth and fifth thoracic segments are the 
epimera distinct from the thorax. 
Eights’ specimens attained a greater size than the largest obtained by the 
‘Discovery,’ and measure 70 mm. x 57 mm., and an adult male is figured both from 
the dorsal and ventral aspects. Dr. Studer’s specimens obtained from Kerguelen 
Island are not half this size, and those obtained by H.M.S. ‘Challenger ’ 
from the same locality are intermediate, the largest being a female measuring 
41 mm. X 35°5 mm. 
For his specimens Eights describes and figures a ridge running obliquely 
backwards from the inner border of the epimera of the first thoracic segment towards 
the middle of its posterior border, before reaching which, however, it dies away. 
This is the only difference I can find between his specimens and those taken by the 
‘Discovery’ when viewed from the dorsum. The dark coloured tubercle Eights 
regards as a possible ocellus; Iam unable to make any statement on this point, this 
structure being injured in the larger specimen. Dr. Studer ignores it altogether, 
Mr. Beddard figures but does not refer to it. 
Dr. Studer*accentuates the fact that, in his specimens, the enlargement between 
the eyes forms conical tubercles, a single one on the inner side of each eye, instead of 
a diagonal row. The “diagonal row” is an expression due to a defect in Kights’ 
figure, and Dr. Studer’s fig. 2 might be a copy of Eights’ as regards this particular 
feature. The point at issue seems to be whether these enlargements each form a 
