BITIIYNIA. 73 



3|, the last obliquely produced ; always imperforate, both in very 

 young and very old shells ; margins of aperture entire, broadly 

 reflected, produced and angled at base, outer margin rounded ; 

 epidermis dark olive-green; under the lens a minute spiral 

 sculpture can be detected. Young specimens invariably show 

 a sort of varix, formed probably at a period when their growth 

 is arrested by some cause, this varix becoming a.bsorbed in adult 

 specimens. 



Alt. 8'75, diam maj. 6 ; alt. anfract. ult. 7 mm. 



Aperture : alt. 5-25, diam. 3 mm. 



Hob. Yaylaymaw, ? Upper Burma. 



" This species can easily be distinguished from the Indian 

 B. cerameopoma and B. lutea; it is imperforate, has fewer whorls, 

 a shorter and more obtuse spire, the columellar margin is less 

 acutely angled at base, the epidermis green instead of brown." 



The original dimensions given by Nevill are quoted below, 

 though some of them are not intelligible. 



"Long. max. 8|, inin. 7|, diam. max. 6, min. 7| mil., long, 

 anfract. ult. 7 ; long, apert. 5J, diam. 3 mil." 



145. Bithynia pulchella (Benson}. 



Bithynia pulchella (Benson), J. A. S. B. v, 1836, p. 746 (as 



Paludina) ; H. & T., C. I. pi. 38, figs. 5, 6. 

 ? = Vafaeta, no. 9, Button, J. A. S. B. iii, p. 90. 



Original description : Testa ovato-comca leviter striata, epider- 

 mide olivacea, anfractibus rotundatis, suturis depressis. Aperturae 

 peritremate nigrescente ; umbilico arco. 



Alt. 7'25 mm. 



Hal. Sylhet (Conch. Ind.). 



Nevill designates two new varieties in his 'Hand List of 

 Mollusca in the Indian Museum,' p. 35, but without descriptions, 

 as follows: 



Yar. obtusa. 



Hcib. Port Canning (StoliczTca). 



Yar. pusilla. 



Presumably a stunted form. 

 Alt. 6*5, diam. 4'5 mm. 

 Hob. Ferozpur (Temple). 



146. Bithynia subpulchella, Nevill. 



Bithynia wbpulchella, Nevill, J. A: S. B. 1, pt. 2, p. 157, pi. 6, 

 fig. 12. 



Original description : [Shell] narrowly rimate, conically ventri- 

 cose, of rather thin substance, slightly transparent, without 



