74 FALUDESTRIXIDJE. 



sculpture, almost white, with a very slight brownish tinge here 

 and there, suture very distinct, spire elongately drawn out, apex 

 rather obtuse; whorls 4|, eonvexly ventricose, the last one 

 tumidly and globosely swollen, about the same size as the others 

 together, a distinct opaque varix on the left-hand side (away 

 from the aperture) on each side of the two last whorls ; aperture 

 nearly round, not oblique, with scarcely thickened, convex, 

 peristome, and columellar margin nearly straight, subangulate 

 at base. 



Very variable in size. Type : Alt. 6, diam. 4 mm. 



Hob. Kutch. 



Type in Indian Museum, Calcutta. 



A thinner form designated by Nevill, var. tenuior, also occurs 

 in the same locality, 



147. Bithynia inconspicna, Dohrn. 



Btihynia inconspicua, Dohrn, P. Z. S. 1857, p. 123 ; II. & T., C. I. 



pi. 37, figs. 5, 6. 



Original description : Testa oblongo-conica, tenera, alba vel 

 fulva, pellucida ; spira acuta ; anfractus 4-5 convexiusculi, sub 

 lente leviter longitudinaliter striati; apertura oblonga. Operculum 

 testaceum, concentricum. 



Alt. 5, diam. 3'5 mm. 



Aperture : alt. 2-5, diam. l'7o mm. 



Bab. Ceylon. 



148. Bithynia orcula, Benson. 



Bithynia oreula, Benson, MSS. in Frauenfeld, Verhandl. zool.-bot. 

 Wien, 1862, p. 1154 ; H. &. T., C. I. pi. 38, figs. 8, 9. 



Shell very convex, globosely conic, scarcely perforate, milk- 

 white, smooth though little polished ; whorls 4, slightly rounded 

 with the exception of the last which is considerably swollen ; 

 aperture large, roundly ovate ; columellar margin somewhat 

 reflexed ; operculum weakly convolute, rather concave with 

 central nucleus. 



Alt. 6-4, diam. 5 mm. 



Hab. Purneah (Con. Icon.). 



Nevill in his 4 Hand List,' pp. 36-37, cites several varieties 

 without other descriptions thau those contained in the names 

 themselves ; these are as below : 



Var. minor. 



Hob. Orissa (Ball). 



Var. prcducta. 



Hab. Sambhar and Salt-Lakes (Stoliezkd)\ Jam ul pur (Stoliczka); 

 Ferozpur (Temple). 



The dimensions of the latter are : Alt, 7, diam, 5'25 mm. 



