﻿PLATE 
  XXV. 
  

  

  Fernando 
  (Pliocene) 
  Pectens. 
  

  

  (Unless 
  otherwise 
  indicated 
  all 
  figures 
  are 
  two-thirds 
  natural 
  size.) 
  

  

  Fki. 
  la. 
  Pecten 
  (Pecten) 
  stearnsii 
  Dall. 
  U.S.N.M. 
  148008. 
  Right 
  valve: 
  altitude 
  

   87 
  mm. 
  View 
  of 
  exterior. 
  San 
  Diego 
  formation 
  (Pliocene), 
  Paeific 
  

   Beach, 
  San 
  Diego 
  County, 
  Cal. 
  Common 
  in 
  the 
  Fernando 
  formation 
  

   of 
  soul 
  hern 
  California. 
  

  

  Fig. 
  16. 
  Same 
  specimen 
  as 
  fig. 
  la. 
  Exterior 
  of 
  left 
  valve. 
  

  

  Fig. 
  2a. 
  Pecten 
  (Pa(inopecten) 
  oiveni 
  Arnold. 
  Collection 
  of 
  University 
  of 
  California. 
  

   Type. 
  Right 
  valve, 
  anterior 
  ear 
  slightly 
  broken: 
  altitude 
  85 
  mm. 
  

   View 
  of 
  exterior. 
  Foxen's 
  ranch. 
  Characteristic 
  of 
  this 
  horizon. 
  

  

  Fig. 
  2b. 
  Same 
  specimen 
  as 
  fig. 
  2a. 
  Exterior 
  of 
  left 
  valve. 
  

  

  Fig. 
  3. 
  Pecten 
  ( 
  Chlamys) 
  lawsoni 
  Arnold. 
  Collection 
  of 
  California 
  Academy 
  of 
  Science. 
  

   Type. 
  Right 
  valve 
  (umbo 
  and 
  ears 
  missing); 
  longitude 
  65 
  mm. 
  View 
  

   of 
  exterior. 
  One 
  mile 
  north 
  of 
  Schumann. 
  Characteristic 
  of 
  this 
  

   horizon. 
  

  

  Fig. 
  4. 
  Pecten 
  (Chlamys) 
  wattsi 
  Arnold. 
  Collection 
  of 
  California 
  Academy 
  of 
  Science. 
  

   Type. 
  Slightly 
  imperfect 
  left 
  valve; 
  altitude 
  G6 
  mm. 
  View 
  of 
  exte- 
  

   rior. 
  Lower 
  Pliocene, 
  Kreyenhagen's 
  ranch, 
  Fresno 
  County. 
  Common 
  

   in 
  the 
  Fernando 
  oi 
  southern 
  California. 
  

  

  Fig. 
  5. 
  Pecten 
  hcmphilli 
  Dall. 
  U.S.N.M. 
  165280. 
  Left 
  valve: 
  altitude 
  22.50 
  mm. 
  

   View 
  of 
  exterior, 
  X 
  1§- 
  One 
  mile 
  north 
  of 
  Schumann 
  (4474). 
  Charac- 
  

   acteristic 
  of 
  this 
  horizon. 
  

  

  152 
  

  

  