ANCYLUS. 1 05 



siibinecliano, subelougato, postice attenimto, acutiuscnlo, ad dex- 

 trum leviter verso ; apertura subrotuiidato-ovata, iiitus albida 

 nitente. 



Alt. 2-0, diam. maj. 6, diani. niin. 4 nun. 



J/ah. Matelle (Matale) District, Ceylon. 



Resembling in some respects tlie A. fiuviatilis of Europe. 



208. Ancylus tenuis, Boxmjuignat. 



Ancylm fcnu/'K, Bouro-uignat, Spicil. Malac, 1862, p. 208 ; Clessin, 

 iji Couch.-Uiib. 1882, p. 62. 



Orvjinal description : — Testa pygmea, depresso-oblonga, fragili, 

 ]a>vi, cornea, vel luteolo-nigresreiite ; — antice siuistrorsusque 

 paululum convexa; postice dexti-orsusque recta, vel paululum 

 concava ; — apice maximo, obtusissimo, paululum canaliculato, 

 postico, dextrorsus paululum dejecto ; — depressione apicali 

 minima, rotundata, ad sinistram partem verticis sita; — apertura 

 oblonga. 



Alt. I'o, diam. maj. 2 mm. 



Hab. Streams iu the Nilgiri Hills. 



209. Ancylus verruca, Benson. 



Annylus verruca, Benson, A. M. N. H. 185o, ser. 2, xv. p. 12; 

 II. it T., C. 1. pi. 81, tigs. 2, 3; Clessin, iu Conch.-Cab. 1882, 

 p. G2. 



Original description. — Testa vix sinistrorsa, depressa, sub- 

 elongato-ovata, postice vix angustiori-laevigata, pallide vireute- 

 flavida vel cim-rea, tenui, intus albida, subniargaritacea, antice 

 siiperne convexiuscula, postice prope umboiiem breviter declivi, 

 umbone vix elevato, compiessiusculo, submediauo, ad spatium 

 t tot 36 testae posita. 



Air. 1, diam. maj. 3-5, diam. min. scarcely 2 mm. 



Hah. BhimtJil; Kemaon Lake; marshes near Moradabad ; 

 near Budaon Rohilla ; Orissa ; Ceylon, etc., always adhering to 

 the tloatiug leaves of water plants. 



From Benson's notes, attached to his original description, it 

 would seem that the present species, though generally sluggish 

 in its habits, is able to swim shell downwards on the surface of 

 the water. 



Subfamily LIMN.^IN^. 



Shell ovate or fusiform \a ith cxscrted, or more or less contracted, 

 spire. 



Distribution. AVorld-wide. 



