ADDITIONS TO THE WEST AJVIERICAN PYRAMIDELLID 

 xMOLLUSK FAUNA, WITH DESCRIPTIONS OF NEW SPE- 

 CIES.» • 



By Paul Bartsch, 



Assistant Curator, Division of MollusJcs, United States National Museum. 



INTRODUCTION. 



The publication of the monograph on the West American Pyra- 

 midellid Mollusks in 1909, as Bulletin 68 of the United States National 

 Museum, appears to have stimulated the workers in mollusks to fur- 

 ther efforts in this field, for there soon followed many requests from 

 west coast collectors for the examination of their collections and the 

 identification of their material. This has been cheerfully done and 

 has resulted in the addition of much new material, as well as an 

 increased knowledge of the distribution of the species previously 

 described. The data pertaining to the distribution of the West 

 American PyramideUidae will be shortly presented for publication in a 

 separate paper. The present paper will be confined to the presenta- 

 tion of the additions made since Bulletin 68 was issued, and to certain 

 corrections of errors, mostly in citation, which have been discovered 

 in that work. 



In this connection I wish to express my thanks to all the corre- 

 spondents who have sent their material to me for examination, which 

 has made this increase of the knowledge of this group possible, and I 

 wish to especially thank Mr. John C. Macoun, of the Geological Sur- 

 vey of Canada, who was kind enough to send us the shells dredged in 

 Barkley Sound, Vancouver Island, British Columbia, which were 

 reported upon by Dr. W. H. Dall and the present writer in Memoir 

 No. 14 of the Department of Mines of the Geological Survey of Can- 

 ada. A report on a second sending from the same general locality 

 is now going through press. The laboi*s of Dr. Fred Baker, Miss 

 J. M. Cooke, Prof. F. W. Kelsey, and Mr. C. W. Gripp have added 

 materially to our knowledge of the fauna of the San Diego region; 



' A supplement to the monograph on this group published as Bulletin (>8 of the I'nited States National 

 Miisfum December 13, 1909. 



Proceedings U. S. National Museum, Vol. 42— No. 1903. 



261 



