360 CALIFORNIA ACADEMY OF SCIENCES. 



Santa Catalina Island. — Prof. Lawson* has called at- 

 tention to the fact, that Santa Catalina Island did not ap- 

 parently share in the Quaternary subsidence. The fauna 

 of this island presents some interesting features, which 

 would seem to confirm Prof. Lawson's deduction. 



Thus, by a study of Dr. Cooper's List of California 

 Fossils, 1888, we find five otherwise extinct species from 

 the Pliocene and Quaternary of Santa Barbara, San Pe- 

 dro and San Diego are living on the island: Aniycla un- 

 data Carpenter, Daphtiella clathrata Gabb, Nassa inscid-pta 

 Carpenter, Psefhis sahnonea Carpenter, SolareUia -pera- 

 mahilis Carpenter. There are also found living on the 

 island and fossil on the coast of the mainland one species, 

 Ci'ytodon jiexuosiis Montagu, only known elsewhere in 

 the North Atlantic; oxiq, Lucina borealis Linneas, known 

 elsewhere only in Arctic waters; one, Laqiieiis calif or- 

 nicus Koch, known elsewhere only ^n the North Pacific. 

 In addition to these, thirteen species, Bittium asferimi 

 Gabb, Callista ncwcomhiana Gabb, Cai'diuni centijilosum 

 Carpenter, Chrysodomus tabidatiis Baird, Diala acuta 

 Carpenter, Le-ptothyra hacula Carpenter, Lucina trunis- 

 culpta Carpenter, Lunatia fallida Broderip and Sowerby, 

 Margarita pupilla Gould, which are found on or about 

 Santa Catalina Island, are only known elsewhere on the 

 coast to the north; while it forms the northern limit of 

 four species, CJiorits belcheri Hinds, Nucula exigiia Sow- 

 erby, OmpJialiiis fuscescens Philippi, Ostrea concha-phila 

 Carpenter. 



These facts indicate that the fauna of Catalina Island 

 has been little affected during a time when many species 

 on the mainland have become extinct and others forced 

 to migrate. 



The fauna is largely northern J:hough possessing a few 



* Uuiv. of Cal., Bull. Dept. Geol., vol. 1, p. 138. 



