PREFACE. IX 



ance to our inquiries. Mr. D. D. Baldwin, the Nestor of 

 Hawaiian conchologists, has lent or given many types and co- 

 types from his collection. Dr. William H. Dall permitted both 

 authors freely to make use of the collections of the National 

 Museum under his charge. Mr. C. W. Johnson extended to 

 the junior author a like courtesy with the collections of the 

 Boston Society of Natural History, which had been the basis of 

 Professor Hyatt's studies. Mr. D. Thaanum of Hilo, Hawaii, 

 has contributed large series of Hawaiian shells of his own col- 

 lecting during many years. Prof. George Wagner submitted a 

 large series of the shells of Molokai from the zoological museum 

 of the University of Wisconsin. This collection was made by 

 Dr. W. J. Goodhue, an American physician at the leper colony, 

 and received through Father Dutton. Other shells for study 

 have been received from Mr. E. P. Van Duzee of Buffalo, N. Y. 

 (taken by his father, 1837-40), and from Mr. Arthur H. Nor- 

 ton, Curator of the Portland Society of Natural History. For 

 specimens and information pertaining to particular species we 

 are indebted to others, as acknowledged in the text. Finally, 

 I would express my appreciation of the careful work of Miss 

 Helen Winchester, who drew on stone the 884 figures illus- 

 trating this volume. H. A. P. 



October, 1911. 





