NO. 2 WALTON : THE GENUS PYLOPAGURUS 155 



Description: Chelipeds dissimilar and unequal, the right much 

 larger; merus compressed, almost as deep as long; carpus long, widening 

 proximally to manus, inner margin marked by row of pointed, forward- 

 hooked spines, upper surface covered with similar smaller spines, outer 

 margin marked by row of more closely spaced spines, granular inferior 

 surface produced to a prominence which often, but not invariably, bears 

 a spine surrounded by a circle of seven or eight smaller spines; hand 

 roughly discoidal, opercular face completely margined by corneous-tipped 

 spines, and covered by widely spaced pointed granules tipped with verti- 

 cally directed slender spines. 



Minor cheliped reaching beyond base of fingers of major hand, carpus 

 bicristate, outer row of spines much the larger; palm depressed, oval, 

 covered with sharp-pointed granules; fingers longer than palm, gaping 

 at base. 



Precervical portion of carapace as broad as long, transversely convex, 

 glabrous ; median point broadly triangular, slightly in advance of angular 

 laterals; postcervical portion membranous, cardiac region distinctly 

 marked off. 



Eyestalks stout, terete, constricted in middle; cornea dilated; oph- 

 thalmic scales generally acutely triangular, with prominent, acute, sub- 

 terminal spine. 



Antennal acicle slender, outward-curving, acute, slightly setose, 

 slightly exceeding length of eyes; peduncle when extended exceeding 

 eyes one half length of compressed terminal article; flagellum setose. 



Antennular peduncle when extended exceeding eyes by length of long 

 terminal article; superior flagellum of about twenty annulations, setose 

 beneath ; inferior flagellum slender, evenly tapering, about two thirds as 

 long as superior. 



Ambulatory legs wide, compressed, slightly longer on right side; 

 merus much compressed, smooth but for slight scales and setae on 

 superior and inferior margins; carpus rounded laterally, crested with 

 sharp spines; propodus of first pair similarly crested, second pair with 

 spines often reduced to mere scales; dactyls spinulose with only sparse 

 setae. 



Fourth pair of thoracic appendages chelate, minute dactyl not bearing 

 rasp as does pollex and anterior portion of propodus ; fifth pair minutely 

 chelate, with tuft of very long setae on distal end of laterally swollen 

 propodus. 



