PREFACE 
As already stated in the Introduction to Volume I, the purpose of this 
work is to bring together the marine shells of the west coast of North 
America from the Arctic Ocean to San Diego, giving the original descrip¬ 
tion, whereabouts of the type and type locality, geographical and geological 
range. The writer has been engaged continuously for eight years in the 
preparation of this work, in the museum at Stanford University and in 
the field from Puget Sound to San Diego; and has made four journeys to 
compare material in the eastern museums: the United States National 
Museum, Philadelphia Academy of Natural Sciences, and the American 
Museum of Natural History, New York. To the authorities of these in¬ 
stitutions the writer wishes to express her thanks for generous assistance. 
In this work are figured all common species of marine mollusca of the 
Californian province, a great many being figured for the first time. When 
figures are not given, full references are made where figures may be seen 
in papers easily accessible. It is the purpose of the writer to make this 
work useful to the amateur as well as to professional conchologist. 
The writer wishes anew to state her many obligations to the following 
for assistance afforded her in preparation of the work: W. H. Dali, Paul 
Bartsch, United States National Museum; H. A. Pilsbry, Philadelphia 
Academy of Natural Sciences; J. P. Smith, T. S. Oldroyd, Stanford Uni¬ 
versity; Roy W. Miner, American Museum of Natural History, New York 
City; B. L. Clark, University of California; Agusta Arnback Christe-Linde, 
Riksmuseum, Stockholm, Sweden; G. C. Robson, Lieutenant-Colonel A. J. 
Peile, British Museum; J. R. LeB. Tomlin, St. Leonards-on-Sea, England; 
R. Spavck, Zoology Museum, Copenhagen, Denmark; Paul Loyning, 
Zoology Museum, Osla, Norway; T. C. Frye, University of Washington, 
Seattle; Paul Dautzenberg, Paris; Nellie Tegland, University of Cali¬ 
fornia; Stanford University; Geological Survey of Canada; San Diego 
Society of Natural History; United States National Museum; Stanford 
Alumni. 
The necessary division of Volume II into three parts has resulted 
in somewhat defective co-ordination of plates and text, but the references 
have been adjusted accordingly. The entire volume, Parts 1-3, has to do 
with the marine gasteropods of the west coast of North America. 
March 1, 1927 
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