316 8. 0. SARS, [N. S. 1v 
Description of the female, 
(Pl. V). 
The length of adult ovigerous specimens does not exceed 5 mm., and this 
species is consequently far inferior in size to the 3 preceding ones, though 
exceeding in this respect the 2 earlier known species. 
The general form of the body (see figs. 1 and 2) is rather short and 
stout, with the 2 chief divisions sharply marked off from each other. As seen 
from the side (fig. 1), the anterior division of the body appears boldly vaulted 
dorsally, and rather attenuated in front. Viewed from above (fig. 2), it ex- 
hibits a regular ovoid form, with the greatest breadth somewhat farther 
back than the middle, and tapers gradually both anteriorly and posteriorly. 
The carapace is rather large and deep, considerably exceeding in length 
the exposed part of the trunk, and exhibits, when seen laterally (fig. 1), a 
somewhat triangular form, the upper contour being nearly straight and 
slightly declining in front, whereas the inferior edges are very strongly 
curved in the middle. The branchial regions are somewhat swollen, and 
marked off from the gastric region by a very conspicuous, obliquely descend- 
ing crest. The gastric area is somewhat flattened and without any dorsal 
keel, terminating in front with a comparatively large ocular lobe of a semi- 
circular form. The pseudo-rostral projection is rather prominent, horizontal, 
and terminating in an obtusely aeuminate point. Below it, there is a very 
slight notch, defining it from the antero-lateral corners of the carapace. The 
latter are very small and obtuse, being scarcely visible, when the animal 
is viewed from above (fig. 9). 
The free segments of the mesosome are all evenly vaulted above, with- 
out the slightest trace of any keel or projections, but have their anterior 
edge somewhat raised. As usual, the 1st segment is the shortest and nearly 
band-like. The 3 succeeding segments are of nearly equal length, whereas 
the last segment is much smaller, though considerably broader than the 
segments of the metasome. The epimera are well-developed, and somewhat 
projecting laterally; those of the last segment are evenly rounded. 
The metasome scarcely exceeds in length the anterior division of the 
body, and has the segments very sharply defined. 
The integuments are rather strongly incrusted, and exhibit everywhere 
à pronounced squamous structure. 
The eye is very fully developed, with all 3 corneæ distinct, and having 
between them a darkish pigment. 
The superior antennz (fig. 3) are somewhat less slender than in the 3 pre- 
ceding species, and have the peduncle only sparingly supplied with bristles. 
Mélanges biologiques. T. XIII, p. 480. 
