146 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 18 



Pylopagurus guatemoci Glassell 



1937 Pylopagurus guatemoci Glassell, Zoologica 22, (3) p. 254. 



Type: Male holotype, New York Zoological Society, Department 

 of Tropical Research, catalogue number 36801, from five miles west of 

 San Jose Point, Pacific side of Baja California, in 45 fathoms. 



Description: Chelipeds dissimilar and unequal, the right much 

 larger; merus smooth, trigonal, as deep as wide, inferomedial margin 

 with deep narrow indentation to receive ischium ; carpus greatly widened 

 distally, superomedial border armed with two prominent, forward-curv- 

 ing spines, one overhanging anterior margin, the other medial; upper 

 surface smooth, lightly setose, rounding gradually to the inferolateral 

 margin; manus discoidal, face four-fifths as wide as long, almost com- 

 pletely surrounded by upturned denticulate margin, proximal margin 

 prominent, teeth irregular in size, tipped with corneous spines, some 

 teeth double, some turned inward; teeth on fingers a continuation of 

 those on palm but diminishing in size, and inclined outward instead of 

 vertical, face of hand set with microscopic low, rounded granules bear- 

 ing long, slender, corneous spines. 



Minor cheliped extending to base of fingers of major hand; carpus 

 bicristate, medial row of spines smaller, hand depressed, outer margin 

 of row of spines extending onto pollex, palm with medial row of small 

 spines, medial margin unarmed and slightly setose. 



Precervical portion of carapace as broad as long, strongly trans- 

 versely convex, smooth-polished; medial projection a broad based tri- 

 angle, three times as wide at base as high, tipped with minute spinule; 

 lateral projections rounded but tipped with minute subterminal spinule; 

 postcervical portion naked, membranous. 



Eyestalks cylindrical, slightly constricted in middle, equal in length 

 to width of front ; cornea very slightly dilated ; ophthalmic scales longi- 

 tudinally convex, bluntly rounded with very prominent, wide based, 

 acute, subterminal spine. 



Antennal acicle slender, curving, acute, reaching just beyond corneal 

 base, margins entire, medial margin setose; peduncle when extended 

 exceeds eyes by one-third length of terminal article; flagellum with 

 scattered setae. 



Antennular peduncle when extended exceeds corneal base by full 

 length of terminal article ; dorsal flagellum densely setose beneath ; ven- 

 tral flagellum small, of five articles with single terminal seta. 



