1920] 



Kew: Cretaceous and Cenozoic Echinaidea 



27 



known forms of the Pacific Coast of tlie United States, of Lower 

 California, and of the Gulf of California province, of which eighty 

 per cent are new. No fossil echinoids have been available from either 

 Canada or Alaska, and the west coast of Lower California is repre- 

 sented by only two species ; the meagerness of the known fauna in 

 these regions is due in all probability to the lack of palaeontologic 

 collecting. 



During the four years in which the writer has been engaged in 

 the study of the fossil Echinoidea of the Pacitie Coast, research has 

 been made possible by the large collections in the University of Cali- 

 fornia, Leland Stanford Junior University, and the California Acad- 

 emy of Sciences. In each of the above institutions collecting is being 

 carried on in the Cretaceous and Tertiary formations of California, 

 which within the last few years has resulted in bringing together a 

 large amount of material. 



Acknowledgment is given here to the museums of these institutions 

 for the generous use of tlie new forms which the writer has been privi- 

 leged to describe. 



To Professor John C. Merriam, whose ever ready advice and co- 

 operation were of the gi'eatest assistance in the preparation of this 

 manuscript, it is the writer's pleasure to express his deepest gratitude. 

 For further advice and criticism the author is indebted to Dr. Bruce 

 L. Clark. 



In the fall of 1914, through the kindness of Dr. F. A. Bather, the 

 writer had the opportunity of studying the echinoderm collections in 

 the British Museum of Natural History. 



Many friends have contributed to the completion of this mono- 

 graph, either by donating specimens or giving helpful suggestions and 

 information. Among these are Professor James Perrin Smith of 

 Stanford University, Dr. Roy E. Dickerson of the California Academy 

 of Sciences, R. W. Pack and W. A. English of the U. S. Geological 

 Survey, and R. C. Stoner and Dr. J. O. Nomlaud of the Geological 

 Department of the Standard Oil Company' of California. The photo- 

 graphing of the specimens was done by W. C. Mathews. 



