514 CALIFORNIA ACADEMY OF SCIENCES LProc. 4th Ser. 



Plate XI. 



Fig. 1. 1 schno chiton coopcri Carpenter. Exterior view of head valve 

 from Deadman Island, San Pedro, California (probably Pleistocene ) 

 [722]. 



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

 same scale as preceding. 



Fig. 3. Ischnochiton coopcri Carpenter. Profile of same valve; camera 

 outline. 



Fig. 4. Ischnochiton coopcri Carpenter. Exterior view of median valve 

 from Deadman Island, San Pedro, California (probably Pleistocene) [723 \. 



Fig. 5. Ischnochiton coopcri Carpenter. Interior view of same valve; 

 same scale as preceding. 



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

 valve ; camera outline. 



Fig. 7. Ischnochiton coopcri Carpenter. Exterior view of median valve, 

 probably from Deadman Island, San Pedro, California (Pleistocene) 

 [648]. 



Fig. 8. Ischnochiton coopcri Carpenter. Interior view of same valve; 

 same scale as preceding. 



Fig. 9. Ischnochiton coopcri Carpenter. Anterior elevation of same 

 valve ; camera outline. 



Fig. 10. Ischnochiton coopcri Carpenter. Exterior view of tail valve 

 from Deadman Island, San Pedro, California (probably Pleistocene) [730]. 



Fig. 11. Ischnochiton coopcri Carpenter. Interior view of same valve; 

 same scale as preceding. 



Fig. 12. Ischnochiton coopcri Carpenter. Profile of same valve; same 

 scale as preceding. 



