104 LlilN-EID.E, 



Order PULMONATA. 



Suborder HYGROPHILA. 



Family LIMNiElD.E. 



Subfamily ANCYLINtI':. 



Shell patelliform, without spiip. 



Distribution. Temperate and Tropical Regions of tlie World. 



Genus ANCYLUS. 



Ancylus. Geoffroy, Traite de Coq. cle Paris, 1767; Clessin, Conch. - 

 Cixb., 1882, p. 11, etc. 



Type, A. Jluviatilis, Linnasus, from Europe generally, Algeria 

 and Madeira. 



llange. Europp, Asia. 



Shell small, patelliform, either dextral or sinistral, thin, conoidal ; 

 aperture either ovate or rounded ; peristome iicute, simple. 



Animnl having tlie ];iter:il teeth of the tongue nnrrow, sharp 

 pointed, and the cardinal [median] tooth, small, rounded. 



206. Ancylus "baconi, Bo^lrg^dgnat. 



Anci/lus haconi, Eourguignat, Cat. Ancvl. in Jo urn. de Conch, iv, 

 1853, p. 181; Boiu-o. Deser. Ancyl. Cuming in P. Z. S. 1853, 

 p. 89, ])1. 25, tigH.^18-25; H. & A. Adnms, Gen. Eec. ls\o\\. 

 ii, 1855, p. 260; Eourg. Spicil. Make. 1802, p. 205; Clessin in 

 Conch.-Cab. 1882, p. 61, pi. 7, fig. 7. 



0?'ifp7icil desrri/dion: — Testa antice recta vel paululiim couvexa, 

 postice recta vel paululum conoava ; apice postieo, obiusi.^simo, 

 paululum dextrorsns dejecto ; depressioiie apicaH vix conspicua, 

 in extremitate verticis sita. Te^1a parva, fiagili, diaphnna, 

 Isevissima, vel concentrice striatula; epidermide albido-virescente ; 

 apertura ovata. 



Alt. 1, diam. maj. 3, diam. min. 2 mm. 



Mab. Bengal. 



207. Ancylus ceylanicus, Benson. 



Ancylus ceylanicus, Benson, A. M. N. H. ser. 3, xiii, 1864, p. 139 ; 

 H. & T., C. I. pi. 81, figs. 2, 3. 



Original descrijjtion : — Testa siiboblonge conoidea, antice con- 

 vexa, postice concava, extus tenuisisime radiato-costulata, costis 

 subremotis elevatioribus munita, striis confertis concentricis de- 

 cussala, viridescenti- cornea, margine lato, lutescenti-cornea, apice 



