1865.] Land and Freshioater Shells from the Shan States. 275 



pauluni remota. Callo flavescente, ore interior! coeralescente. Anfrac- 

 tibus 6J. 1.45 X 1-10 



Var. carinata, Carinis quatuor fortissimis supra munitur, et infra 

 peripheriam sex vel quinque lsevioribus ; colore albido ; epidermide 

 flavescente; fasciis nonnullis castaneis interdum ornata. 1.40 X 1-00. 



These two varieties pass into each other, but the peculiar columella!* 

 callus is pretty constant in all specimens. But for this character, some 

 of the smooth variety might be referred to P. Eengalensis, which 

 is an extremely variable species. 



The strongly corded var. is well marked, but I have preferred taking 

 the smooth shell as the type of the species, and have regarded the 

 keeled individuals as hypertrophied, placing the greatest value, as a 

 specific character, on the columellar callus, occurring in both varieties. 



2. P. melanostoma. Paludina 2. 



1. Bithinia nassa, n. s. 



Testa elongata, turbinata, polita, diaphana, solidiuscula. Labio 

 expansiusculo, plica callosa externa munita. Anfractibus quinque. 

 0.45 X 0.25. 



This is the only species of Bithinia in the collection, and it is well 

 characterised by the strong rib-like fold strengthening the lip outside, 

 somewhat as in " nassa." 



1. Ampidlaria, sp. 



A small species similar to that found at Maulmein, but distinct 

 from the smaller species met with in the Arakan hills. 



An ordinary specimen measures, 1.75. Aperture 1.25. A very large 

 specimen of the Arakan species. 1.45. Aperture 0.95. 



Fam. HeliciDjE. 



Of Helices of all sections, the collection comprises twenty-three 

 species, nearly one half of which seem undescribed. 



1. Helix, n. s. 



A large dextral species of six whorls partaking the characters of H. 

 interru/pta and H. semidecussata, but very distinct from either. All 

 the specimens are unfortunately dead shells. Lat. 1.55 X Alt. 0.75. 



2. H. Blanfordi, Th. 



This species was originally founded on a single shell from Darjiling 

 in my cabinet, which, from its sculpture, I had no hesitation in separat- 

 36 



