5QQ CAL1F0RXIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Plate VII. 



Fig. 1. 1 schno chiton fallax Carpenter. Exterior view of median valve 

 from Nob Hill Cut, San Pedro, California (Lower San Pedro Pleistocene) 

 [650]. 



Fig. 2. Ischnochiton fallax Carpenter. Interior view of same valve; 

 same scale as preceding. 



Fig. 3. Ischnochiton fallax Carpenter. Anterior elevation of same 

 valve ; camera outline. 



Fig. 4. Ischnochiton magdalcncnsis (Hinds). Exterior view of head 

 valve from Chiton Bed, Point Fermin, California (Lower San Pedro 

 Pleistocene) [946] ; same scale as Fig. 1. 



Fig. 5. Ischnochiton magdalcncnsis (Hinds). Profile of same valve; 

 camera outline. 



Fig. 6. Ischnochiton magdalenensis (Hinds'). Exterior view of median 

 valve from Chiton Bed, Point Fermin, California (Lower San Pedro 

 Pleistocene) [1086] ; same scale as Fig. 1. 



Fig. 7. Ischnochiton magdalcncnsis (Hinds). Interior view of same 

 valve; same scale as preceding. 



Fig. 8. Ischnochiton magdalcncnsis (Hinds). Anterior elevation of 

 same valve ; camera outline. 



Fig. 9. Ischnochiton magdalcncnsis (Hinds). Exterior view of tail 

 valve from Chiton Bed, Point Fermin, California (Lower San Pedro 

 Pleistocene) [1087] ; same scale as Fig. 1. 



Fig. 10. Ischnochiton magdalcncnsis (Hinds). Profile of same valve; 

 camera outline. 



