8 G. O. Sars. 
few strong spines are seen to project, and the hind con- 
cave edge of the segment is armed dorsally with about 6 
small denticles, beyond which the soft skin, flanking the 
anal orifice, projects in the form of 2 short rounded lobes. 
In the specimen described by Messrs. Spencer & Hall, the 
terminal caudal segment is much more spinous, but it is 
most probable, that the number of spines increases with age. 
The eyes (see fig. 1) are rather large and of the usual 
reniform shape, slightly converging anteriorly, and having 
here between them the ocellus, which shines distinctly 
through the integuments as a small dark spot. Immediately 
behind the eyes, the post-ocular tubercle is seen in the form 
of a nearly semicircular prominence. 
The shell-glands are easily observable as 2 narrow, 
sabre-like areas extending obliquely along the sides of the 
carapace from the cervical furrow to some distance from 
the posterior corners. 
The 1st pair of legs (fig. 2) exhibit the structure cha- 
racteristic of the genus, the endites (excepting the rudi- 
mentary, scale-like 5th one) being much elongated and thread- 
like, and projecting laterally far beyond the edges of the 
carapace. The 4th endite, as usual, is much the longest, 
being fully twice as long as the stem, and, like the other 
3, has the edges divided into small, spinulose ledges, exhi- 
biting also in certain places a distinct segmentation. The 
outer appendages (exopodite and epipodite) are very small. 
The 2nd pair of legs (fig. 3) are much more strongly 
built than the Ist, and are, as usual, more or less incurved, 
and prehensile in character, exhibiting a rather distinct seg- 
mentation. Of the endites, the 5th is well developed, 
though not quite attaining the length of the 4th, and has 
the form of a lanceolate claw, finely denticulated inside, and 
