328 G. 0. SARS, (sam 
The eye contains but 2 corneæ, which are placed far apart, one at each 
corner of the broad ocular lobe, whence the animal has the appearance of 
being binocular. 
The superior antenne (fig. 4) are rather elongated, with the joints of 
the peduncle successively increasing in length, and provided with scattered 
bristles, 3 of which, belonging to the Ist joint, are distinctly ciliated. The 
flagella exhibit the usual structure. 
The inferior antenn (see fig. 5) have each, as in the other species of 
the genus, the form of a uni-articulated, conical projection tipped by a rather 
strong plumose seta. 
The oral parts do not exhibit any essential difference from those in the 
other species. 
The gnathopoda (figs. 6 and 7) likewise exhibit the usual structure. 
The 1st pair of legs (fig. 8) are rather slender, and resemble on the whole 
those in P. tenuicauda. 
The 2nd pair of legs (fig. 9) appear somewhat more robust than in that 
species and more richly clothed with ciliated setze, but otherwise are also 
rather similar. 
The 3 posterior pairs (figs 10,11) are rather strongly built and densely 
setiferous, being constructed nearly in the same manner as in P. tenuicauda. 
The uropoda (see fig. 12) are comparatively large, considerably exceeding 
in length 1 of the metasome. The scape is somewhat flattened, and exhibits 
inside a row of about 14 sete. The rami are nearly equal-sized and about 
the length of the scape. They are both mucroniform in shape, and terminate 
with 2 unequal spines, neither of which attains any great length. The inner 
ramus is armed along the inner edge with a dense series of comparatively 
small spinules, about 17 in number. The outer ramus is, as usual, somewhat 
narrower than the inner, and has the inner edge finely ciliated and provided 
with a single small seta near the tip. 
The telson (ibid.) is nearly quadrate in outline, the breadth about — 
ling the length. 
Description of the male. 
(Pl. XI). 
Adult male specimens are considerably larger than the females, attaining 
a length of fully 10 mm., and also differ conspicuously in their outer habitus. 
The general form of the body (see figs. 1 and 2) is comparatively much 
more slender and elongated, with the metasome rather strongly developed. 
The anterior division exhibits in the lateral aspect (fig. 2) a similar form to 
that in the female, though perhaps a little broader in its anterior part and 
Mélanges biologiques, T. XIII, p, 492. 
