VIII.— D ESCRIPTIONS OF NEW SPECIES OF 



MARINE AND FRESHWATER SHELLS 



IN THE COLLECTION OF THE 



INDIAN M U S E U M, CALCUTTA. 



By H. B. Preston, F.Z.S. 



■.. - Bittium insulsmn, sp. nov. ' ' /■ 



Shell elongately fusiform, narrowly perforate, yellowish white 

 with a broad circular band of pale reddish brown ; whorls 9, can- 

 cellate with transverse ribs and spiral grooves ; aperture oval ; 

 peristome simple. 



Altitude . . . . 3 mm. 



Diam., major . . • . . i ,, 



Habitat — Galle, Ceylon. 



Type in Indian Museum, Calcutta. 



■ Gottonia andamania , sp. nov. 



Shell conical, ver^- solid, white, strongly keeled at periphery ; 

 whorls 5, rather fiat, spirally Urate and transversely costate, pre- 

 senting a somewhat minuteh^ nodilous appearance ; sutures im- 

 pressed, aperture circular ; peristome thickened. 



Altitude . . . . 2 mm. 



Diam., major . . . . i ,, 



Habitat — Andaman Islands. 



Type in Indian Museum, Calcutta. 



Bithynia pygmcBa, sp. nov. 



Shell ovately fusiform, dark olive-brown; whorls ^^, convex, 

 smooth ; sutures well impressed ; aperture oval ; peristome simple, 

 continuous ; umbilicus narrow ; operculum shelly, spiral with cen- 

 tral nucleus. 



Altitude . . . . 3-25 mm. 



Diam., major . . 

 Aperture, alt. . . 

 ,, diam. 



Habitat— Myetmyo, Burma 



Type in Indian Museum, Calcutta, 



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