316 G. 0. SARS, [X. S. IV 



Des(ii|t(ion of (he female. 



(PI. V). 



The length of adult ovigeroiis specimens does not exceed 5 mm., and this 

 species is consequently far inferior in size to the 3 preceding ones, thougli 

 exceeding in this respect the 2 earlier known species. • 



The general form of the body (see tigs. 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 foiuu, 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 (tig. 1 ), a 

 somewhat ti'iangular form, the upper contour being nearly straight and 

 slightly declining in front, wdiereas 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 acuminate 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. 2). 



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 

 a pronounced squamous structure. 



The eye is very fully developed, with all 3 cornege distinct, and having 

 between them a darkish pigment. 



The superior antenusc (fig. 3) are somewhat less slender than in the 3 pre- 

 ceding species, and have the peduncle only sparingly supplied with bristles. 



Melanges l)iologic|ues. T. XIII, p. 480. 



