122 LIMXJEIDJE. 



243. Planorbis (Gyraulus) associatus, Westerlund. 



Planorbis (Gyraulus) associatus, Westerlund, in Vega Exped. 

 Vetenskapliga Jakttagelser, iv, p. 205, pi. 4, fig. 17. 



Original description : Testa depressa, supra plana, centre vix 

 impre'ssula, subtus late convexiuscula (anfractus ultimus circum- 

 circa altior et spira sensim profuudior), striatula, nitidula, cornea ; 

 anfr. 5, lente accrescentes, primi convex!, caeteri convexinsculi, 

 sutura sat profunda disjuncti, ultimus sensim latior, non dilatatus, 

 peripheria obsolete angulatus, utrinque subaequaliter convexi- 

 usculus ; apertura obliqua, ovato, peristomate subincrassato. 



Alt. 1-5, diam. 5*5-6*5 mm. 



Hab. Point de Galle, Ceylon. 



Almost certainly a variety of P. (G.) demissus. 



244. Planorbis (Gyraulus) elegantulus (Dokrn). 



Planorbis (Gt/raulus) elegantulus (Uolirn), P. Z. S. 18o8, p. 134; 

 H. & T., G! I. pi. 151, figs. 1-3. 



Original description: Testa discoidea, albida sub lente teuuiter 

 striata, nitida, pellucida, supra convexiuscula, umbilicata, subtus 

 plana ; anfr. 4-5 lente accrescentes, ultimus infra medium obsolete 

 carinatus ; apertura perobliqua, sublunaris ; peristomium rectum, 

 intus calloso-albo-labiatum. 



Diam. maj. 4-75, diam. min. 4 mm. 



Aperture : alt. 1 mm. 



I Jab. Ceylon. 



245. Planorbis (Gyraulus) nanus (Soiv.). 



Planorbis (Gyrauhts) nanus (Sow.), Sowerby, iu Reeve, Conch. Icon, 

 xx, pi. 9, sp. 75 ; Benson, P. Z. S. 1856, p. 186. 



Shell pale fulvous, compressed, rather convex above, broadly 

 and deeply umbilicated below ; spire narrow, flat ; whorls 3, 

 obliquely striated, rapidly increased, last very broad ; aperture 

 depressed, very bread, outer lip obliquely produced above. 

 (Sowerby in Reeve.} 



Diam. maj. 11, diam. min. 10 mm. (fig. 75 a in Conch. Icon.). 



Hab. India ; subfossil, Tsoral Lake, Tibet (Captain H. Stmcliey}. 



246. Planorbis (Gyraulus) rotula (Benson). 



Planorbis (Gyraulus) rotula (Benson), A. M. N. H. ser. 2, v, 

 1850, p. 351 ; H. & T., C. I. pi. 99, figs. 2, 3. 



Original description: Testa minuta, depresso-nlanata, aper- 

 tissime umbilicata, luteo-cornea, diaphana, impolita, spiraliter 

 obsolete striata; anfr. 3|, cylindraceis, lenie horizontaliter in- 

 crescentibus, supra et subtus asqualiter apparentibus ; ultimo ad 

 periphffirium rotundato, nullo modo angulato : sutura supra in- 

 fraque profunde impressa ; umbilico minime profundo ; apertura 

 vix obliqua, rotundato-lunata ; margine superior! arcuato. 



