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 antennae. 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 ; I am 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 Eights' 

 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 



