NO. 2 WALTON : THE GENUS PYLOPAGURUS 159 



points obtuse but tipped with sharp spinule; postcervical portion mem- 

 branous, becoming hairy on branchial regions, cardiac region defined as 

 a quadrangular plate. 



Eyestalks terete, constricted in middle with median line of tufted 

 setae on dorsal surface, cornea dilated ; ophthalmic scales convex, pointed, 

 margins entire with subterminal spine slightly protruding. 



Antennal acicles slender, outward-curving, very hairy on medial 

 margin, reaching corneal base; peduncles when extended slightly exceed- 

 ing reach of eyes; flagellum very slender, greatly exceeding reach of 

 major hand, with short, very fine setae. 



Antennular peduncles when extended exceed eyes by one half the 

 length of the distally flaring third article. 



Ambulatory legs of equal length on both sides, only slightly com- 

 pressed, very hairy on dorsal surface, unarmed but for single tooth 

 medially placed on distal end of dorsal surface of carpus and spinules 

 above and below on the dactyli. 



Fourth pair of thoracic legs very short, subchelate, rasp restricted to 

 terminal margins; fifth pair minutely chelate, outer surface of swollen 

 propodus covered by rasp, lower margin with line of long, silky setae. 



Abdomen obese, terga not distinct except in caudal shield ; anterior 

 tergum larger, tufted, convex, front corners rounded, posterior corners 

 produced, suture only slightly flexible ; posterior tergum with setal tufts 

 on terminal margin. 



Telson divided into two lobes, both asymmetrical, the posterior great- 

 ly so, left side much larger; posterior margin medially notched and 

 bearing several strong, downward-curving teeth; uropods larger on left 

 side, posterior blade much reduced on both sides. 



Distribution: Off Cocos Island, Costa Rica, in 66-100 fathoms 

 (Faxon 1895). 



Specimens in the Hancock collections are from Nuez Island and 

 Chatham Bay, Cocos Island, and north of Hood Island, Galapagos 

 Islands. The station numbers are as follows : 



773-38 2 

 780-38 6 

 814-38 2 



The depths ranged from 20 to 50 fathoms. 



