194 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 23 



PLATE 9 



Fig. 1. Cychpecten catalinensis (Willett), 1931. Hancock expedi- 

 tions station 570-36, off Tiburon Island, Gulf of California, 

 in 12 fathoms. Height and length: 10 mm. (Hancock 

 Foundation collection. Photograph by R. V. George.) P. 



Fig. 2. Cychpecten cocosensis (Dall), 1908. Lectotype. Albatross 

 station 3369, off Cocos Island, Costa Rica, in 52 fathoms. 

 Height: 8.7 mm; length: 9 mm. (U.S. National Museum 

 collection, no. 122870. Photograph by F. B. Kestner, 

 U.S.N.M.) P. 



