148 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 18 



Pylopagurus hancocki n. sp. 



Type: Male holotype AHF no. 362, dredged by the Velero HI 

 2 March 1936 at the station 534-36 off San Francisquito Bay, Gulf of 

 California, in 125 fathoms. 



Diagnosis: Merus of major cheliped trigonal, inner margin of 

 carpus with three spines, two medial and one distal; opercular surface 

 of hand entirely margined by regularly spaced, inward-curving spines 

 with sharp corneous tips; median projection angular, apex sharply trun- 

 cate, lateral points rounded, almost obsolete. 



Description: Chelipeds dissimilar and unequal, the right much 

 larger; merus trigonal, upper surface setose; carpus narrow proximally, 

 widening evenly to manus, medial margin bearing three distinct, for- 

 ward-curving spines, two medially and one distally, superior surface 

 lightly setose; opercular surface three fifths as wide as long, widest point 

 just distal to base of fingers, completely margined by evenly spaced spines 

 with sharp corneous tips directed inward, separated by rounded sinuses; 

 fingers broad, having line of tufted setae bordering cutting edges. 



Minor cheliped reaching base of fingers of major hand; carpus 

 rugose, with coarse setae, inner margin armed with two minute spines 

 medially and large distal spine which is partially cleft, leaving two points 

 on single base; outer margin of hand marked by row of small spines 

 reaching to base of pollex, large spine supported by a ridge on medio- 

 proximal margin; dactyl longer than palm, setose. 



Anterior portion of carapace not quite as broad as long, transversely 

 convex, slightly rugose, and bearing a few tufts of setae, median point 

 angular, apex sharply truncate, lateral points rounded, almost obsolete; 

 posterior portion membranous, slightly setose on branchial regions. 



Eyestalks stout, terete, constricted in middle, slightly setose on 

 superior surface ; cornea dilated ; ophthalmic scales longitudinally convex, 

 triangular, margins entire, with prominent subterminal spine. 



Antennal acicle slender, outward-curving, pointed, reaching middle 

 of cornea; peduncle when extended exceeding eyes by two thirds the 

 length of the cylindrical terminal article ; flagellum setose. 



Antennular peduncle when extended exceeding length of eyes by full 

 length of terminal articles ; superior flagellum of about eighteen annula- 

 tions, densely setose beneath, inferior flagellum almost equal in length 

 to superior. 





