_13L_ 



being composed of 9 joints rather densely clothed with short curved setae; 2nd 

 joint the largest and rather broad at the base; terminal joint nearly as long as 

 the 2 preceding ones combined, and carrying at some distance from the end the 

 usual sesthetask. Posterior antennae exceedingly powerful and exhibiting a some- 

 what sigmoid curvature, penultimate joint much the largest, terminal joint short 

 and thick, carrying on the end a very strong curved claw accompanied inside 

 by another much smaller claw; outer ramus forming a narrow, lancet-shaped 

 lamella attached near the end of the 2nd (basal) joint, and provided with 3 

 small bristles. Mandibles comparatively short, and terminating in a simple point. 

 Maxilla?, with the outer lobe very small and provided at the tip with 3 com- 

 paratively short subequal setae ; inner lobe widening considerably distally, spatu- 

 late in form, and carrying on the transversely truncated extremity 3 ciliated 

 spines and 2 abruptly recurved slender and densely ciliated seise. Anterior 

 maxillipeds with the dactylus rather slender, biarticulate, and provided beyond 

 the middle with a small secondary spine, tip sharply pointed. Posterior max- 

 illipeds with the hand somewhat fusiform, and provided at about the middle of 

 the inner edge with a ciliated seta; dactylus slender, triarticulate, with no spine 

 inside the 1st joint, terminal claw occupying about half the length of the dactylus. 

 1st pair of legs with no seta inside the proximal joint of the outer ramus, distal 

 joint of this ramus with 3 very slender spines outside; distal joint of inner ramus 

 rather large, with 7 setae, one of which issues from the outer edge. The 2 suc- 

 ceeding pairs of legs with both rami distinctly 3-articulate and rather slender, 

 spines of outer ramus dagger-shaped; inner ramus with the terminal joint produced 

 at the end into 2 dentiform projections, between which in the 2nd pair 2 sub- 

 equal setae are affixed, in the 3rd pair only a single dagger-like spine; number 

 of setae on the inner ramus of the latter pair somewhat reduced, the middle 

 joint having only a single seta and the terminal joint 2 setae inside. 4th pair 

 of legs present as a small bisetose joint attached to each side of the corresponding 

 segment and accompanied outside by a small bristle. Free joint of last pair of 

 legs of somewhat larger size and provided with 3 setae, 2 apical and one lateral. 

 Male (according to Scott) very like the female in its outward appearance, 

 but of smaller size. 



Colour in female pale yellow, with darker translucent ovarial tubes and 

 with some slight ochraceous pigmentary patches on each side of the cephalic 

 segment and trunk; eye bright red and occurring unusually far back. 

 Length of adult female 0.80 mm. 



Remarks. This form is closely allied to the type species, P. Richardi 

 Scott, and was indeed regarded by that author as merely a variety of this species. 



18 Crustacea, 



