320 6. 0. SARS, [x. s. 1v 
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 cornez distinct. 
The superior antennz (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 antenne, 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, ani 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 !/, of the metasome. The scape is rather narrow, and has on the inner 
edge a series of about 9 setz. 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. 17) attaiu 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 corneæ 
more prominent and refractive. 
The superior antennz (fig. 11) are modified in the usual manner. 
The same is also the case with the inferior antennæ (fig. 12) and 
the legs (fig. 13, 14). As in the male of P. pectinata, the dactylar joint 
Mélanges biologiques. T. XIII, p. 484, 
