ANCYLUS. 105 



submediano, subelongato, postice attenuate, acutiusculo, ad dex- 

 trum leviter verso ; apertura subrotundato-ovata, intus albida 

 nitente. 



Alt. 2-5, diam. maj. 6, diam. min. 4 mm. 



Hab. Matelle (Matale) District, Ceylon. 



Resembling in some respects the A. fluviatilis of Europe. 



208. Ancylus tenuis, Bourguignat. 



Ancylus tenuis, Bourpruignat, Spicil. Malac., 1862, p. 208 ; Clessin, 

 in Conch.-Cab. 1882, p. 62. 



Original description : Testa pygmea, depresso-oblonga, fragili, 

 i, cornea, vel luteolo-nigrescente ; - antice sinistrorsusque 

 paululum convexa; postice dextrorsusque 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. 1*5, diam. maj. 2 mm. 



Hab. Streams in the Nilgiri Hills. 



209. Ancylus verruca, Benson. 



Ancylus verruca, Benson, A. M. N. H. 1855, ser. 2, xv. p. 12 ; 

 H. & T., 0. I. pi. 81, figs. 2, 3 ; Clessin, in Conch.-Cab. 1882, 

 p. 62. 



Original description. Testa vix sinistrorsa, depressa, sub- 

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

 flavida vel cinerea, tenui, intus albida, submargaritacea, antice 

 superne convexiuscula, postice prope umbonem breviter declivi, 

 urn bone vix elevato, compiessiusculo, submediano, ad spatium 

 totaB testae posita. 



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



Hab. Bhimtal ; .Kemaon Lake; marshes near Moradabad ; 

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

 the floating 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 



Shell ovate or fusiform with exserted, or more or less contracted, 

 spire. 



Distribution. World-wide. 



