406 Mr. W. H. Benson on some new sjjecies of Helix. 



cis-Gangetic species provided with teeth in the mouth. These 

 are apt to be overlooked, or mistaken for accidental grains of 

 white sand. 



The next form was described and published twelve years ago ; 

 but as fuller characters are desirable for the purpose of com- 

 parison with the two subsequent species, I insert them here. 



4. Helix vesicula, nobis (amended character). 



Testa perforata, depressiuscula, vel subdepresso-globosa, obsolete 

 striata polita, pellucida, pallide cornea ; spira plus minusve elevata, 

 apice acutiusculo ; sutura submarginata ; antractibus 5^ -6, con- 

 vexiusculis, sensim crescentibus, ultimo rotundato, ventricosiu«culo; 

 apertura vix obliqua, rotundato-lunari, longitudine latitudinem 

 sequante ; peristomate simplici, recto, margine columellari verticali, 

 breviter reflexo, cum basali angulum rotundatum efformante, per- 

 foratione membrano fere clausa. 



Diam. major \A\, minor 12, axis 1\ mill. 



Var. Diam. major 14, axis 8^- mill. 



N. vesicula, Benson, Jour. Asiat. Soc. Calcutta, vol. vii. p. 216, 1838. 



Hab. in agris Bengalensibus prope Soti-Durga, ad apicem Deltse 

 Gangeticae. 



I discovered this pretty species during the rainy season of 1835, 

 in a river voyage from Calcutta to Benares, on the branches of a 

 shrubby Zizijphus, and below Rajmahal on Asclepias gigantea, 

 not creeping on the ground like its darker-coloured ally H. vitri- 

 noides, Desh. The animal was, as in that species, a Macrochlamys, 

 nobis, ' Jour. Asiat. Soc/ vol. i., 1832 (as distinguished from that 

 of Ariophanta, Desmoulins, 1829, which corresponds with that of 

 Nanina, Gray, 1834), with reference to the great length and nar- 

 rowness of the tentacula-like processes of the mantle, which lubri- 

 cate the surface of the shell even to the apex. A full description 

 of the animal of H. vitrinoides will be found in vol. v. of the 

 'Zoological Journal ' for 1834, long prior to the date of Mr. 

 Strickland's observations on the same subject in the 'Annals' for 

 November, 1819. 



5. Helix Lecythis, nobis, n. s. 



Testa subobtecte perforata, depressiuscula vel orbiculato-conoidea, 

 obsolete striata, nitida, pellucida, pallide cornea ; spira plus minusve 

 elevata, apice acutiusculo, sutura submarginata ; anfractibus 6, 

 convexiusculis, sensim crescentibus, ultimo rotundato : apertura 

 vix obliqua, lunari, latitudine longitudinem vix superante, callo 

 parietali tenui rugosiusculo ; peristomate ■ simplici, recto, margine 

 CDlumellari oblique arcuatim descendente, superne triangulato 

 reflexo ; perforatione membrano fere clausa. 



Diam. major 14, minor 13, alt. 9 mill. 



Var. Diam. major 12, minor 10, alt. 6 mill. 



Hab. in montibus prope Rqjmahal Bengaliae. Teste Dr. J. F. Bacon, 



