508 C ALIFORM A ACADEMY OF SCIEXCES [Proc. 4th Ser. 



Plate VIII. 



Fig. 1. Ischnochiton conspicuus Carpenter. Exterior view of head valve 

 from Long Wharf Canyon, Santa Monica, California (Upper San Pedro 

 Pleistocene) [350]. 



Fig. 2. Ischnochiton conspicuus Carpenter. Interim- view of same 

 valve ; same scale as preceding. 



Fig. 3. Ischnochiton conspicuus Carpenter. Profile of same view; 

 camera outline. 



Fig. 4. Ischnochiton conspicuus Carpenter. Exterior view of median 

 valve from "coal mine", west side of Point Loma, California (Upper San 

 Pedro Pleistocene) [499]. 



Fig. 5. Ischnochiton conspicuus Carpenter. Interior view of same 

 valve ; same scale as preceding. 



Fig. 6. Ischnochiton conspicuus Carpenter. Anterior elevation of same 

 valve ; camera outline. 



Fig. 7. Ischnochiton conspicuus Carpenter. Exterior view of tail valve 

 from Deadman Island, San Pedro, California (Pleistocene) [346] ; same 

 scale as Fig. 1. 



Fig. 8. Ischnochiton conspicuus Carpenter. Interior view of same 

 valve ; same scale as preceding. 



Fig. 9. Ischnochiton conspicuus Carpenter. Profile of same valve; 

 camera outline. 



Fig. 10. Chaetopleura gemma Carpenter. Exterior view of median 

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

 Pleistocene) [1025]. 



Fig. 11. Chaetopleura gemma Carpenter. Interior view of same valve; 

 same scale as preceding. 



Fig. 12. Chaetopleura gemma Carpenter. Anterior elevation of same 

 valve ; camera outline. 



