132 PROCEEDINGS OF THE MxVLACOLOGICAL SOCIETY. 



remains to be proved ; but, conchologically, they only appear to 

 differ in size. 



For the present, therefore, I would suggest the following as a 

 convenient working classification: — 



Genus Macrochlamys, Benson. 



Section Macrocldamys, s.str. 



Type M. Indica, Benson, to include all the highly 

 polished, depressed, almost and quite imperforate species, 

 which have no callosity in the aperture. 

 Section Microcystina, Morch. 



Type M. Rinhii, Morch, to include the species which 

 have a reflected columellar lip showing a sinus or notch. 

 Section Lamprocystis, Pfeiffer. 



First species L. excrescens, Mousson, to include the 

 species having a dentiform callosity on the columellar lip. 



It has been already shown by Colonel Godwin-Austen^ that the 

 radula and jaw of Microcydina are similar to those oi Macrochlamys; 

 and he has formed a subfamily Macrochlaminaj to contain Macrochlaniys, 

 Mierocystina, and Uemiplecta, giving Helix JIumphreysiana, Lea, as 

 the type of the latter genus. 



The species grouped under Microcystis by Semper'^ would appear 

 to fall in this grouping under Macrocldamys, his first species being 

 M. myops, Semper and Dohrn. 



' "Mollusca of India," vol. i, p. 12. 



2 " Eeisen im Areli. der Phil.," LandmoUuskeu, 1870, p. 43. 



