414 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Seh. 



This locality is known to me only as above quoted. Quite 

 possibly it is the same, or part of the same deposit as the "coal 

 mine" referred to as No. 15 above. Two chitons were ob- 

 tained, 



Cryptochiton stelleri (Middendorff) 

 Ischnochiton acrior Carpenter 



The appearance of the individual specimens is much like 

 those from the preceding station. I refer them to the Upper 

 San Pedro. 



18. Spanish Bight, North Island, San Diego, California 

 (Mrs. Kate Stephens). 



This exposure has been given detailed treatment by Arnold 

 ( :03, p. 59-64), but without recording any chitons. Two 

 species are represented in the material before me: 



Ischnochiton conspicuus Carpenter 

 pectinulatus Carpenter 



STATIONS OF UNCERTAIN RELATIONSHIP 



In the Oldroyd collection with the scant label "Upper San 

 Pedro" are the following chitons, all from Southern Califor- 

 nia, and presumably from the neighborhood of San Pedro, 

 but the exposure and exact locality unknown : 



Mopalia muscosa (Gould) 

 lignosa (Gould) 

 acuta (Carpenter) 

 " sp. 

 Ischnochiton conspicuus Carpenter 

 fallax Carpenter 

 coo peri Carpenter 

 cf. sinudentatus Carpenter 

 sp. 

 Callistochiton crassicostatus Pilsbry 



If, as seems probable, all of the above are from the same 

 exposure, the association would seem to be much more that of 

 the Lower than of the Upper San Pedro, as labeled. 



In the Arnold collection labeled Deadman Island, California, 

 (formation unknown) are the following: 



