viii. 



AUTHOE'S PEE FACE. 



A Memoir on the Whelk has long been desired by 

 many University teachers who have regularly included 

 Buccinum as a type of the Monotocardia in their 

 laboratory courses. It is hoped that the present treatise 

 will enable this very easily procured gastropod to be 

 used to better advantage by students. 



Most of the material made use of in the investigation 

 has been obtained from Port Erin ; and I should like 

 to express my thanks to Mr. H. C. Chadwick, the Curator 

 of the Biological Station, for much kind help in this 

 connection. 



I wish also to take this opportunity of acknowledging 

 the great aid Professor Herdman has constantly given 

 me by his advice and by his careful editing of my work; 

 and, further, to thank Mr. H. G. Jackson, Miss C. M. G. 

 Lewis and Miss E. L. Gleave, amongst my past and 

 present students, for their help from time to time during 

 the progress of the work. 



W. J. Dakin. 



