264 Bulletin Vanderbilt Marine Museum, Vol. VII 



being dorsally visible beyond the body. The distal portion of the 

 merus and carpus are dorsally spinose-setose ; the propodus is 

 as long in the median line as the combined length of all the pre- 

 ceding articles and is oval in contour, dorsally very convex with 

 a slight outer submarginal depression which also extends the 

 length of the proximal finger ; the fingers meet throughout their 

 length, the black apices being rounded, spoon-like. The outer 

 margins and surface are beset with strong, outward and some- 

 what obliquely directed, thorn-like, black-tipped spines, inter- 

 spersed with stiff, coarse bristles, which most frequently but not 

 always, arise in ones, twos, or threes, being much more abundant 

 than those on P. setifer, but never forming wreaths around the 

 base of the spines as in setifer, yet not obscuring the surface 

 sculpture and spines, as occurs on P. punctulatus Oliver. The 

 right cheliped is similar but smaller. 



The ambulatory legs of the first and second pairs have the 

 legs of the right side with the respective dactyli longer than those 

 of the left side, the other right joints being only as long as those 

 of the left legs. The second left ambulatory leg is very special- 

 ized, having the propodus and dactyl widened and ornamented 

 uniquely. The propodite has this outer lateral surface 0.7 as 

 wide as long, decisively longitudinally carinate, this spinose carina 

 occurring about 0.4 of the width from the inferior or posterior 

 margin, with the outer 0.6 of this surface distinctly more deeply 

 concave. The inferior lateral margin and adjacent surface, in- 

 cluding the carina, bears in close-set, transverse series approxi- 

 mately six spines per series, the first spine being marginal and 

 the sixth accentuating the carina, while the more concave outer 

 portion of this surface, between the carina and the superior mar- 

 gin bears about four smaller intermediate spines, per transverse 

 series, in addition to the palisaded, outer, marginal row of 

 stronger spines. Repetition of this transverse series occurs 

 across the entire length of the article. The related dactyl, which 

 is a little more than 1.5 times as long as the propopdus, is decid- 

 edly curved, with the anterior margin convex, the posterior, con- 

 cave, with the flattened, outer surface narrowed distally, both 

 lateral margins and the longitudinal carina spinose as on the pre- 

 ceding article, with the concave surface between the inferior 

 margin and carina shallowly concave and continuously beset with 

 spines, about two in transverse series proximally and one spine 



