ARIOPITANTA. 39 



68. Ariophanta bistrialis, Beck (Nauina), Ind. Mol i, p. 2 (1837, 

 descr.); Pfr. in Chemn. ed. 2, 1846, Helix, no. 61, pi. 11, figs. 10, 

 11 ; id, (Helix) Mon. Hel. i, 1847, p. 71 ; id. t. c. vii, 1876, 

 p. 122 ; H. $ T. (Helix) C. I. 1876, pi. 29, fig. 1 ; Godwin- 

 Austen (Nilgiria), Mol Ind. ii, 1898, p. 80, pi. 81, fig. 4 (genitalia), 

 pi. 82, fig. 6 (radula). 



Helix ceylanica, Pfr. Zeitschr. Mai. 1850, p. 67 ; id. Mon. Hel. 

 iii, 1853, p. 71; id. t. c. vii, 1876, p. 122; H. % T. C. I. 1876, 

 pi. 29, fig. 3 ; Godwin-Austen (Nilgiria), Mol. Ind. ii, 1898, p. 126 

 [(description of animal, genitalia, and radula)]. 



Helix taprobanensis, Dohrn, Mai. El. vii, 1859, p. 206 ; Pfr. Mon. 

 Hel. v, 1868, p. 116 ; H. $ T. C. 1. 1876, pi. 29, fig. 2. 



? Helix cyix, Bs. A. M. N. H. (3) v, 1860, p. 382 ; Pfr. Mon. 

 Hel. v, 1868, p. 236 ; H . $ T. C. I. 1876, pi. 29, fig. 4. 



Fig. 22. Ariophanta bistrialis. 



Shell perforate, subglobosely depressed, thin, finely striated, 

 decussated above with impressed spiral lines, polished below, pale 

 horny, encircled by two rufous lines (one or both sometimes 

 wanting), with a whitish band between them, the upper line 

 continued inside the suture on the upper whorls ; spire low, 

 convex ; whorls 4|, nearly flat, rapidly increasing, the last not 

 descending, convex beneath ; aperture large, oblique, lunately 

 ovate ; peristome thin, with the columellar margin slightly reflected. 



Major diarn. 30, min. 25, axis 17 mm. ; aperture 16 broad and 

 16 high. 



Hob. Madras Presidency and Ceylon. I found this shell as 

 far north as the Gadavari at Dumagudiam, but I have seen 

 no specimens from the Malabar coastland. Large specimens 

 up to 40 mm. in size have been obtained on the Shevroy Hills by 

 Mr. J. It. Henderson. 



The usual South-Indian form (bistrialis) is pale-coloured and 

 smooth with two rufous lines ; the common Ceylon form is darker 

 in colour with a single line (ceylanica) but both varieties occur in 

 each area, and also shells without any bands : taprobanensis is a 

 large rather thick variety from Ceylon; cyix is a dwarf form, 

 rather globose, generally with the colour-lines faint or wanting, 

 from Matelle. I have also a specimen from Trincomali. 



Teeth in radula of A. bistrialis 50 . 2 . 17 . 1 . 17 . 2 . 50 

 (69.1.69); of the vw. ceylanica 62 . 2 . 19 . 1 . 19 . 2 . 62 (83 . 1 . 

 83). The inner or admedian laterals, like the rhachidian, are 

 tricuspid, gradually losing the side cusps ; outer laterals aculeate. 



