VI PREFACE. 



ian species were worked up in great part by the junior, other 

 species by the senior author; but in many cases throughout 

 the work both authors contributed material on the same 

 species. The primary responsibility for the new species is 

 indicated by the sequence of author's initials following the 

 specific names. Both authors have had the advantage of 

 studying Tornatellinidae in the field. 



The present study of Tornatellinidae is based, for the most 

 part, on the collection of the Bishop Museum, containing 

 nearly 3,000 lots from the Hawaiian Islands, including Mr. 

 Ancey's Hawaiian collection and types, and on the collection 

 of the Academy of Natural Sciences, about 500 lots from 

 nearly all regions inhabited by these snails. 



Mr. Samuel Henshaw, of the Museum of Comparative Zo- 

 ology, has generously permitted examination of the material 

 in his charge, including part of the types of W. H. Pease. 

 We are indebted to Mr. W. F. Clapp for a MS. catalogue of 

 Tornatellinida3 and Achatiuellidas in the same museum. 



Dr. Wm. H. Ball allowed us to study and illustrate certain 

 specimens in the United States National Museum. 



Mr. Tom Iredale sent the material he had collected in the 

 Kermadec Islands. 



Certain types in the British Museum we are able to figure 

 by the kindness of Mr. E. A. Smith. 



The privilege of studying material from the Newcomb col- 

 lection we owe to Professor G. D. Harris, of Cornell Uni- 

 versity. 



Messrs. D. Thaanum, of Hilo, and Irwin Spalding, of Hono- 

 lulu, have opened their great Hawaiian collections to us. 

 Many of our new species are testimonials to their ability in 

 the field. 



We are also sensible of the continued encouragement 

 afforded by the President and Publication Committee of the 

 Academy of Natural Sciences of Philadelphia and the Direc- 

 tor and Trustees of the Bishop Museum, Honolulu. 



H. A. P. 

 C. M. C. 



Philadelphia, and Honolulu, 



February, 1916. 



