B1TIIYNIA. 71 



Paluclina impura, Brard, Coq. Paris, 1815, p. 183, pi. 7, fig. 2. 

 Paludinajaculator, Studer, Kurz. Verz. 1820, p. 91. 

 Turbo tentuculcitus, Sheppard, Trans. Linn. Soc. xiv, 1823, p. 152. 

 Biikyniajaculator, Risso, Hist. Nat. Eur, Merid. iv, ]826, p. 100. 

 Palndind tentaculata, Fleming, Brit. Anira. 1828, p. 315. 

 Bithinia tentaculata, Gray, Turton Man. 1840, p. 93, pi. 10, fig. 120. 

 Bithinia (Eiona) tentaculata, Moquin-Tandon. Hist. Moll, ii, 1855, 



p. 528, pi. 39, figs. 23, 24. 

 Bythinia tvntaculata, Reeve, Brit. L. & F. W. Moll. 1863, p. 189. 



" Shell : conically ovate, with a minute nearly closed umbilicus, 

 fulvous green, subtransparent, apex rather sharp ; whorls five, 

 smooth, convex, the last rather ventricose ; aperture somewhat 

 pyriformly ovate, lip dark-edged, scarcely reflected. Operculum 

 subtestaceous, striated concentrically around a central nucleus." 

 (Reeve.} 



Hab. Throughout Europe (in gentle streams and still waters). 



Nevill gives the following variety without other description 

 than the dimensions : 



Var. kashmirensis. 



Alt. 7, diam. 4-5 mm. 



Hab. Kashmir (Stoliczlca) ; Srinagar (Kashmir) (Theobald ?). 



141. Bithynia cerameopoma (Benson). 



Bithynia cerameopoma (Benson), Gleanings in Science, Calcutta, 

 ii, p. 125 (name for sp. in vol. i, p. 362 ) (as Paludina) ; J. A. S. B. 

 xxiv, 1855, p. 131. 



Bithi/nia ceranospatana, Frauenfeld, Verhandl. zool.-bot. Wien, 

 1862, p. 1156 5 H. & T., C. I. pi 38, figs. 1, 4. 



Original description : Small, ovate-oblong, whitish -yellow, 

 subhyaline, the lip at the base of the columella slightly produced; 

 operculum calcareous. 



The above meagre description may be supplemented by the 

 following, based on a specimen in the British Museum : 



Shell oblong-ovate, cinereous shading to yellowish white ; 

 whorls 5, regularly and rather rapidly increasing, convex, 

 minutely and obsoletely sculptured with very fine, spiral striae 

 and marked with rather weak growth lines ; suture well im- 

 pressed ; umbilicus moderately narrow, deep ; labrum continuous, 

 slightly reflexed, bevelled within ; aperture a little oblique, ovate ; 

 operculum shelly, slightly concave, with subcentral nucleus, 

 having about seven convolutions. 



Alt. 10-75, diam. maj. 9, diam. min. 6 mm. 



Aperture: alt. 6, diam. 4'25 mm. 



Hab. Bengal. 



There is in the British Museum a second set of this species, 

 presented by Captain T. Hutton and labelled " Plains India." 

 The shells in this set are of rather smaller dimensions than those 



