486 g. o. SARS, [t. xiii 



Description of the female. 



The length of a fully grown ovigerous specimen is about 6 mm., and this 

 species is thus somewhat larger than P. gracilis. 



The general form of the body (see figs 1 and 2) is rather slender, though 

 not nearly to such a degree as in P. gracilis. The anterior division of the 

 body is of an oblong oval form, and on the whole considerably thicker than 

 in that species, both as seen from above (fig. 1) and laterally (fig. 2). Moreo- 

 ver, in the latter aspect, its upper face appears considerably vaulted in the 

 middle, and it thus marks itself off more sharply from the slender metasome. 



The carapace is considerably larger than in the afore-said species, ex- 

 ceeding in length the exposed part of the trunk, and has the branchial re- 

 gions more distinctly defined. The pseudo-rostral projection is rather promi- 

 nent, quite horizontal, and terminating in a sharp point. The antero-lateral 

 corners, as in P. gracilis, project but little, and are obtusangular, being 

 defined above by a slight notch. 



The free segments of the mesosome are evenly vaulted above, without 

 any trace of keel or projections, but have their anterior edge somewhat 

 raised. They are, on the whole, considerably deeper than in P. gracilis, other- 

 wise of a very similar form. 



The metasome is very slender and, as in that species, exceeds in length 

 the anterior division of the body. Its segments are cylindrical of form, and 

 exhibit the usual longitudinal relation. 



The eye is well developed, with all 3 corneae distinct. 



The superior antennae (fig. 4) do not differ materially from those in P. 

 gracilis. 



The posterior gnathopoda (fig. 4) have the basal joint rather large, and 

 provided on the distal part of the inner edge witli 4 strong, plumose setae. 



The legs (figs. 5 — 9) on the whole resemble in structure those in P. 

 gracilis, though comparatively somewhat more strongly built. In the 2nd 

 pair (fig. 6) the terminal joint is comparatively larger than in that species, 

 being considerably longer than the carpal joint, and has one of the apical 

 spines much prolonged. 



The uropoda (see fig. 10) are very slender, and exceed in length l / s of 

 the metasome. The scape is of a narrow cylindrical form, and carries along 

 the inner edge a series of about 8 not very large spinules. The rami are 

 very narrow, nearly equal-sized, and about the length of the scape. The 

 inner ramus has on the inner edge 6 very small spinules and 2 unequal ones 

 at the tip; the outer ramus has, besides the 2 apical ones, only a single 

 small bristle on the inner edge, near the tip. 



The telson (ibid.) exhibits the same semi-elliptical form as in P. gracilis. 



Bulletin N. S. IV (XXXVI) p. 322. 



