H E present volume contains only Oriental and Australasian 

 Bulimi, of tlie families Bulimulidce and Helicidce. The classifi- 

 cation of Pulmonates is now in a transitional stage, and it was 

 impossible to see, a few years ago, that the genus Bulimus would 

 become merely a name suggestive of a certain shell-contour, ahd 

 standing for no natural group. Hence, some genera which should 

 have been intercalated in the Helicid series were left for treatment 

 with the Bulimulidce. Amphidromus, a genus undoubtedly belonging 

 among the epipballogonous Hcticidce, near Papuma, Chlorites, etc., 

 thus finds place in this volume. 



The genera Bothriembryon and Placostylus are true Bulimulidce^ 

 allied to the South American series. This family is a typically 

 " Austral " group. 



In the preparation of this volume 1 have received material assist- 

 ance from Dr. J. C. Cox, Prof. W. H. Dall, Prof. F. W. Button, 

 Mr. Charles Hedley, and Mr. H. Suter, who have supplied specimens 

 or notes bearing on Bothriembryon and Placostylus. Specimen? of 

 Amphidromus have been received from Messrs. C. F. Ancey, G. H. 

 Clapp, John Ford, John B. Henderson, Jr., Chas. W. Johnson and 

 H. E. Sargent, and Mr. Hugh Fulton favored me with colored 

 figures of some forms of which only uncolored illustrations had been 

 published. To all of these gentlemen my most hearty thanks are due. 



H. A. P. 



Philadelphia, Noiwnber, 1900. 



