324 G. 0. SARS, [n.s. IV 



Remarks. — The present species is cliiefly distinguished by the extremely 

 narrow and feeble metasome, and by the unusually strong development of the 

 3 posterior pairs of legs, which again causes an unusual development of the 

 corresponding segments of the mesosome. 



Description of the female. 



Full grown ovigerous specimens scarcely exceed a lengtli of S'/j mm, 

 and this form is therefore much smaller than any of those described in the 

 preceding pages. 



The general form of the body (see figs 1 and 2) appears somewhat slender, 

 being, however, not nearly so much elongated as in the 2 preceding species. 

 The anterior division of the body is very sharply marked off from the posterior, 

 and appears somewhat compressed, the height considerably exceeding the 

 breadth. As seen laterally (fig. 1), it e.xhibits an oblong oval form, with the 

 upper face but very little arched, and only quite posteriorly suddenly de- 

 clining to the base of the metasome. As seen from above (fig. 2) it appears 

 rather narrow oblong, and but very slightly tapering to each extremity. 



The carapace is not very large, scarcely exceeding in length the exposed 

 part of the trunk, and exhibits in the lateral aspect (fig. 1 ) a rounded oval 

 form, with the upper contour nearly straight and horizontal, and the inferior 

 edges considerably curved. The branchial regions are but faintly marked off 

 from the adjacent parts of the carapace. The gastric area exhibits the usual 

 shape, and terminates in front with a semicircular ocular lobe. The pseudo- 

 rostral projection is not very prominent, is horizontally projected, and termi- 

 nates in a sharp point. The sinus below it is very slight, and the antero- 

 lateral corners but slightly projecting, and obtuse. 



The free segments of the mesosome are quite smooth above, and rather 

 deep, with broad laminar epimera. The 3rd segment is dorsally, to some 

 extent, overlapped by the succeeding one, and appears therefore rather short 

 in the middle, but expands considerably on each side. The last 2 segments 

 exhibit a somewhat unusual shape, being nearly as deep as the preceding 

 ones, and very oblique. Their lateral parts are, as it were, swollen and filled 

 up with strong muscles joining the corresponding legs. The last segment 

 suddenly declines towards the insertion of the metasome, and has the epi- 

 mera evenly rouuded. 



The metasome is extremely narrow, and scarcely at all as long as the 

 anterior division of the body. Its segments are simple cylindric, and exhibit 

 the usual longitudinal relation. 



The integuments are very thin and pellucid, though exhibiting traces of 

 the usual squamous structure. 



Melanges biologiqnes. T. XIII, p. 488. 



