240 LAXD A>'D FRESHWATER 



in India now, compared with the number in the early fifties and 

 sixties of the last century. The Geological Survey of India was 

 coospicuous at that time for the number of Assistants, includiiig 

 its first Director, Thomas Oldham, who, beyond their own special 

 work, were collectors of, and several of them writers on, the Verte- 

 brates and Invertebrates, as the pages oi the Journal of the Asiatic 

 Society of Bengal show. I can recall the names of some thirty 

 more in other branches of the service who were working at the 

 Fauna of India at about the same period. 



This retrospect reminds me that William Theobald, of the 

 Geological Survey of India, who for nmny years did good work 

 for Indian Conchology, has passed from amongst us — one whose 

 collections, particularly those preserved in spirit from many parts 

 of India, have greatly assisted me in bringing out this publication. 

 Theobald died at Ilfracombe. Devon, on 31st March, 1908. 



Subfamily MACROCHLAMTiifjE. 



Genus Macrochlamys. 

 {Continued from Vol. II. p. 170.) 



Although this genus occupies so many pages of this work, on 

 account of the very great number of species it contains, there 

 still remain a very large number to be noticed. The animals of 

 manv are little known, while numerous species from Assam and 

 Burma are new, and have to be described and their atlinities 

 indicated. Species of the genus such as Macroclilamys suhjecta, Bs. 

 and vesicida, Bs., may be taken as typical of a group I shall first 

 deal with, having a general shell character, and a smooth-shiny 

 surface, with a similar external aud internal structure of the animal. 

 The shell of M. suhji:da is figured from the typical locality in the 

 Gaugetic delta, Eajmahal, in order to better ilhistrate the differ- 

 ence between it and shells somewhat similar from the Eastern 

 Frontier of India, which Geoffrey Nevill and other conchologists 

 considered to be this species {vide p. 25 of the 'Hand-list'). 

 Fortunately I have had for comparison a fine series of shells and 

 animals collected by myself over a large extent of country, 

 supplemented by Dr. N. A nnandale sending me many species of 

 this genus from the Indian Museum, Calcutta, particularly a good 

 series from Cachar collected by the late Dr. Wood- Mason, and yet 

 another valuable consignment, mostly in spirit, collected and 

 preserved for me by Mr. F. Edc of Silehar. My best thanks are 

 due to them for this valuable assistance, without which the results 



