328 0. 0. SAKS, [i\. S. IV 



The eye contains but 2 corne^e, 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 antennae (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 1st joint, are distinctly ciliated. The 

 flagella exhibit the usual structure. 



The inferior antennae (see fig. 5) have each, as in the other species of 

 the genus, the form of a uni-articulated, conical projection tii)ped by a rather 

 strong plumose seta. 



The oral parts do not exhibit any essential difierence 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 setae, 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. 1 2) are comparatively large, considerably exceeding 

 in length Yg of the metasome. The scape is somewhat flattened, and exhibits 

 inside a row of about 14 setie. 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 equal- 

 ling the length. 



Deseription of the male. 



(PI. 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 



Melanges biologiqnes. T. SIII, p. 192. 



