LAND AND FRESHWATER MOLLUSCA 
OF 
i ReT, A 
VOL. III. 
Part I.—NOVEMBER 1920. 
(Plates CLIX.—-CLXYV.) 
INTRODUCTION. 
In spite of the very limited interest which is taken in the animals 
of the land mollusca, I am induced to commence Volume ILI. of 
this work; for until the species in the many Oriental genera 
are collected, their anatomy made known, and their true habitat 
recorded, any attempt to use them for classification or any deeper 
research is not possible. The work of the Conchologist is simply 
useless unless this is done and the physical features of India are 
taken into account. During the war I have not been able to 
carry on this publication, begun 37 years ago and ended in 
two volumes in 1914. On the other hand, I have had leisure 
to do much with the material in my hands, and to add to it, 
especially specimens preserved in spirit, and have described the 
animals of many Indian Genera previously unknown, I have 
had much support—more than I had hoped to receive—and from 
many quarters : for this I cannot express my thanks too strongly. 
I must especially notice Dr. N. Annandale, with Messrs. 8. W. 
Kemp and F. H. Graveley of the Indian Museum. I feel it a duty to 
those who have supplied material, to put what I have brought 
to light on record, as a starting-point for those who will follow 
me in this wide and difficult field of research, so full of deep 
interest to anyone who enters it. 
PART I. B 
