484 6. 0. SARS, [t. XI11 



The metasome is extremely slender and elongated, considerably exceed- 

 ing in length the anterior division of the body, and has the segments simply 

 cylindric in form. 



The integuments are rather thin and semipellucid, though exhibiting 

 trace of the usual squamous structure. 



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



The superior antennae (fig. 3) have the joints of the peduncle nearly of 

 equal length and rather slender, being only supplied with a few scattered 

 bristles. 



The inferior antennae, oral parts and gnathopoda do not differ essentially 

 from those organs in the other species. 



The legs (figs. 4 — 8) are on the whole rather slender, and resemble in 

 structure those in P. pectinata, with the exception that the rudimentary 

 exopodite of the penultimate and antipenultimate pairs (figs. 6 and 7) is 

 somewhat larger. 



The uropoda (see fig. 9) are comparatively slender, equalling in length 

 about Y 3 of the metasome. The scape is rather narrow, and has on the inner 

 edge a series of about 9 setae. The rami are nearly equal-sized, and about 

 the length of the scape, both nearly linear in form. The inner ramus is armed 

 inside with 8 slender spines, and carries on the tip 2 unequal spines, the 

 outer of which is much the larger. The outer ramus likewise terminates in 

 2 unequal spines, the inner of which is very much elongated, nearly attaining 

 the length of the whole ramus; it has moreover on the inner edge 4 slender 

 spines or bristles and another on the outer edge. 



The telson (ibid.) is rather small and nearly semi-elliptical in form, being 

 fully as long as it is broad at the base, and evenly rounded at the tip. 



Description of the male. 



Adult male specimens (fig. 1 7) attain about the same size as the females, 

 and, setting aside the usual sexual characteristics, do not differ much in 

 their outward appearance, exhibiting, as they do, a similar slender and elon- 

 gated form. The carapace is, however, comparatively larger, nearly equal- 

 ling in length the exposed part of the trunk, and has the pseudo-rostral 

 projection somewhat shorter and more obtuse, whereas the antero-lateral 

 corners are broader and more expanded laterally. 



The eye is considerably larger than in the female, and has the corneae 

 more prominent and refractive. 



The superior antennae (fig. 11) are modified in the usual manner. 



The same is also the case with the inferior antennae (fig. 12) and 

 the legs (fig. 13, 14). As in the male of P. pectinata, the dactylar joint 



Bulletin N. S. IV (XXXVI) p. 320. 



