412 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



15. Long Wharf Canyon, Santa Monica, California (F. 

 C. Clark). 



This extremely rich deposit has never been thoroughly dealt 

 with in the literature, although a number of species, including 

 many novelties, have at various times been described from it. 

 Ckace ( :17, p. 30-31) has listed several of the chitons. From 

 the faunal evidence the stratigraphic affiliations are unquali- 

 fiedly with the Upper San Pedro. The majority of the species 

 are essentially identical with those inhabiting the waters of 

 the adjacent coast at the present day, but they are also usually 

 species whose present metropolis lies to the south rather than 

 to the north, or even in some instances, as Ischnochiton acrior 

 of our list, no longer occur north of Lower California. The 

 following chitons have been recognized from the material sub- 

 mitted by Dr. Clark : 



Leptochiton clarki Berry, new species 



Mopalia acuta (Carpenter) 

 sp. 



Acanthochitona avicula (Carpenter) 



Ischnochiton conspicuus Carpenter 

 acrior Carpenter 

 pectinulatus Carpenter 

 sanctcemonicce Berry, new species 



Callistochiton crassicostatus Pilsbry 



palmulatus mirabilis Pilsbry 



The most remarkable faunal feature here is the enormous 

 relative abundance of the two species of Callistochiton. Out 

 of 330 valves, 197, or nearly two-thirds, are C. p. mirabilis, 

 and 71, or nearly one-fifth, are C. crassicostatus. The un- 

 identified Mopalia with 18, Ischnochiton acrior with 14, and /. 

 scmctamonica with 13, are the only others met with in any 

 number. 



16. "Coal mine", west side of Point Loma, San Diego 

 County, California (Mr. and Mrs. Frank Stephens, Carl L. 

 Hubbs). 



This horizon, always referred to by Mrs. Stephens as "the 

 coal mine", offers a fauna which is in some respects quite 

 unique, yet seems to have had very little attention from pre- 



