NO. 2 WALTON : THE GENUS PYLOPAGURUS 149 



Pereiopods slightly longer on right side, slightly compressed, setose, 

 with margins unarmed except for spinules on lower margins of dactyli ; 

 propodus equal in length to the related dactyl. 



Fourth pair of thoracic legs subchelate, rasp on propodus only ; fifth 

 pair minutely chelate. 



Abdomen short, membranous, terga not present except in well cal- 

 cified caudal shield; anterior tergum transversely and longitudinally 

 convex, slightly setose, rough, anterolateral corners rounded off, sulcus 

 deep and flexible ; posterior tergum smaller, with tufted setae on postero- 

 lateral corners and two tufts on terminal margin. 



Telson symmetrical, simple, calcareous plate, semioval in outline with 

 margins entire; uropods slightly larger on left side. 



Measurements: Total length (rostral point to tip of abdomen) 7 

 mm; length of carapace 2.75 mm; length of precervical region 1.75 mm; 

 width of precervical portion 1.50 mm; length of major manus 3 mm; 

 width of major manus 1.75 mm; length of dactyl 1 mm; length of carpus 

 2 mm ; length of minor manus 1 .25 mm ; width of minor manus 0.75 mm ; 

 length of propodus first ambulatory leg 8.5 mm; length of dactyl first 

 ambulatory leg 8.5 mm ; length of caudal shield 1 mm ; width of caudal 

 shield 0.75 mm. 



Distribution: Known only from the type locality, off San Fran- 

 cisquito Bay, Gulf of California. 



Discussion: This species is closely related to P. guatemoci, but may 

 be distinguished from it by the three large spines on the superior surface 

 of the major carpus (P. guatemoci having but two), the truncate rostral 

 point, and the partially cleft spine on the distal end of the carpus of the 

 minor cheliped. 



Remarks: The carcinoecium was a gastropod shell completely over- 

 grown with cheilostomatous Bryozoa. 



The species is named for Captain Allan Hancock in recognition of 

 his contributions to the zoological knowledge of the Pacific regions. 



Pylopagurus coronatus (Benedict) 



1892 Eupagurus coronatus Benedict, Proc. USNM 15 (887) p. 24. 

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



Type: Holotype, U.S.N.M. Catalogue number 16699. From Alba- 

 tross station number 2829, off Cape San Lucas, Gulf of California, in 

 31 fathoms. 



