xii PREFACE. 



Mr. T. IREDALE did a good deal of collecting during some 

 time, and he published lists of the Mollusca found at Titahi 

 Bay, Banks Peninsula, and Otago. He also described a few new 

 species, unfortunately without figures, and up to the present day 

 lie has failed to present the types to the Canterbury Museum, 

 as promised in his publication. 



In vols. xliii and xliv of the Trans. N.Z. lust, there are 

 two excellent papers on the anatomy of Siphonaria obliquata by 

 Mr. A. J. COTTRELL, of Auckland. 



I wish to express my grateful thanks to all those who 

 kindly assisted me in my work, either by giving me useful 

 advice and information or assisting me with material viz., 

 Captain J. Bollons ; Dr. W. H. Ball, U.S. Nat, Museum, Wash- 

 ington ; Sir Charles Eliot, Sheffield ; Messrs. J. H. Gatliff, 

 Melbourne ; A. Hamilton, Wellington ; Charles Hedley, Assistant 

 Curator of the Australian Museum, Sydney; W. L. May, Sand- 

 ford, Tasmania ; Miss M. Mestayer, Wellington ; Mr. J. H. 

 Ponsonby, London ; Professor Dr. H. R. Simroth, Leipzig ; Mr. 

 Edgar A. Smith, I.S.O., British Museum (Nat. Hist,). London ; 

 Dr. H. Strebe!, Hamburg : Dr. J. Thiele, K. Zoologisches 

 Museum, Berlin ; Dr. J. C. Verco, Adelaide. 



Finally, I have to express my obligations to the Government 

 Printer and to the Supervisor of the Government Printing Office 

 for the great care they have taken in passing the work through 

 the press, and to Mr. A. Hamilton for his kind help in the 

 production of the plates of the atlas. 



HENRY SUTER. 



Christchurch, September, 1913. 



