INTRODUCTORY NOTE. XI 



on the wing. It is desirable, moreover, that search 

 should be made for living mollusca in the crops of birds 

 and in the stomachs of other shell-eating creatures. 



It need hardly be added that communications 

 with which the writer may be favoured will be wel- 

 comed at the under-mentioned address, and carefully 

 acknowledged. 



H. W. K. 



5, Giesbach Road, Upper Holloway, London. 

 September, 1893. 



