175 
FEMALE. The largest specimen is 5°3 mm. long, 5°5 mm. broad and ab. 3°9 mm. 
thick; the specimen represented in fig. 2a, which had laid eleven ovisacs, was 3°15 mm. long, 
3°65) mm. broad and 2°7 mm. thick; the young specimen drawn in fig.2b, was 1°7 mm. long 
and broad. The anterior part of the frame of the head (fig. 2 d) rises somewhat above the 
skin in front of it; it is tolerably narrow in the middle, broader towards the base of the 
antennule; the foremost lateral angle of the frame is strongly produced and forms a con- 
siderable, tolerably broad and not quite short, outstanding, rounded projection, a large part 
of which, however, is covered by the soft skin. A good deal of the lateral borders and of 
the short hindmost part of the frame is likewise covered by soft skin similar to that of the 
surroundings, and on each side, where the lateral and the anterior parts meet, we see, more- 
over, two good-sized chitinous parts beneath the skin. On the other hand, the long list which 
in Ch. mirabile runs outward and backward from the centre of the exterior side of the 
frame, is altogether wanting. The two pairs of small rings in the skin in front of the 
rostrum are advanced to close behind the anterior part of the frame; the sub-median pair 
are larger, the more lateral pair much narrower than in the preceding species. The anten- 
nule are a little longer than in Ch. mirabile, and have longer sete. The antenne’ are 
also longer than in the last-mentioned species. distinctly 3-jointed, the basal joint short, the 
two next joints about sub-equal in length, the terminal seta longer than the third joint. 
Mouth-border fairly broad. Maxille good-sized, larger tban in Ch. mirabile. Maxillipeds 
rudimentary, yet somewhat larger than im the preceding species and otherwise of the same 
structure. The hindmost part of the sub-median skeleton consists on each side of a tolerably 
narrow, posteriorly somewhat expanded list; as in the preceding species a long and robust 
branch proceeds anteriorly from the exterior side outward just behind the base of the maxilla. 
In front of the antennulee, before and outside the foremost free lateral angle of the frame, 
and thence more or less backward outside its lateral margins, we see in the adult specimens 
a number of fairly short or short setae (fig. 2d), obliquely outside the lateral angle some 
very long sete; fig. 2a, moreover, shows a fairly broad stripe furnished with scattered 
sete running from each lateral angle somewhat forward and strongly outward along the 
ventral surface of the animal towards its anterior outline. Younger specimens (fig. 2b) not 
only have setae — some of them very long — on these last-mentioned parts (fig. 2 e), but 
also a number of similar sete on the sides and on a small part of the ventral surface, as 
well as a few scattered sete on the back, whereas the greater part of the ventral side is 
naked. The trunk-legs are very distinct in the smaller specimen represented in fig. 2b, but 
in the larger animal (fig. 2a) I have not been able to find any. The lateral margins of the 
genital area (fig. 2f) differ somewhat in shape from Ch. mirabile, being geniculate in the 
centre, so that only their foremost half turns inward. As in the preceding species, the 
genital area sends forth from its posterior central part two strongly diverging, tolerably 
short lists, between which, in the half-grown as well as in the adult specimens, we find the 
