122 mm7^.t:id.i;. 



24;^. Planorbis (Gyraulus) associatus, Westei-lund. 



I'/anorbift {(iyraiilua) associdtus, Westerhnid, in Vei>a Exped^ 

 \etenskapliga Jakttagelser, iv, p. 20-"), pi. 4, fig. 17. 



Orif/inal description : — Testa depressa, supra plana, centro vix 

 impressula, subtiis late convexiuscula (aiifractus ultinius circvim- 

 ciroa altior et spira sensim profiuidior), striatula, nitidula, cornea ; 

 anfr. 5, lente accrescentes, prinii convexi, cfeteri convexiusculi, 

 .sutiira sat profunda disjunct!, ultimus sensim latior, non dilatatus,. 

 peripheria obsolete angulatus, utrinque subtequaliter coiivexi- 

 usculus ; apertura obliqua, ovato, pevistomate subincrassato. 



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



Hab. Point de Galle, Ceylon. 



Almost certainly a variety oF /'. (G.) 'Jeviissus. 



244. Planorbis (Gyraulus) elegantulus (Dohm). 



rianorhiA (Oi/rd/ilus) cleyantulus (Uolirii), P. Z. S. 18-')8, p. 134; 

 II. & T., {/. I. pi. 151, figs. 1-3. 



OrUjiiwl description: — Testa discoidea, albida sub leute teiiuiter 

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

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

 cariuatus ; apertura perobliqua, subiunaris ; peristomium rectum, 

 int us calloso-albo-labiatum . 



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



Aperture : alt. 1 mm. 



Hab. Ceylon. 



245. Planorbis ( Gyranlus) nanus {Sow.). 



Flanorhis [Gi/raidiit:) }unui.< (Sow.), Sowerby, in Reeve, Conch. Icon. 

 XX, pi. 9, sp. 75 : Benson, P. Z. S. 1856, p. 186. 



Sliell pale fulvous, compressed, ratlier convex above, broadly 

 and deeply umbilicated below; spire narrow, Hat; wliorls 3, 

 obliquely striated, rapidly increased, last very broad ; aperture 

 depressed, very bread, outer lip obliquely produced above. 

 {Sowerby in Ihevc.) 



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

 J lab. India : subfossil, Tsoral Lake, Tibet {Captain H. Strachey). 



24G. Planorbis (Gyraulus) rotula {Beji.^on). 



Flanorbis (fri/raidus) rutida (Penson), A. M. N. II. ser. 2, v, 

 1850, p. 35i ; II. & T., C. 1. pi. 90, tigs. 2, 3. 



Oriyinal description : — Testa minuta, depresso-olanata. aper- 

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

 obsolete striata; anfr. 3^, cylindraceis, lenie borizontaliter in- 

 crescentibus, supra et subtus axpialiter apparentibus ; ultimo ad 

 periphoerium rotnndato, nullo modo angulato ; sutura supra in- 

 fraque profunde impressa ; umbilico minime profundo ; apertura 

 vix obliqua, rotuiulato-lunata ; margine superiori arcuato. 



