36 



A. semirugata is a thinner smoother variety ; A. tranquebarica 

 thicker, with stronger sculpture, and more globose. 



Animal with a triangular right dorsal lobe to the mantle and a 

 long narrow left dorsal lobe. .Foot not divided. 



In the genitalia distal portion of penis-sheath very long and 

 convolute ; the retractor muscle of the male organ is given off 

 from an extremely long diverticulum. A cylindrical kale-sac, 

 about as long as the epiphallus. Spermatheca bulbous, on a short 

 narrow neck. Dart-sac very large and long. 



Kadula with 54 . 3 . 17 . 1 . 17 . 3 . 54 (74 . 1 . 74) teeth in a row : 

 rhachidian tooth tricuspid ; the admedians close to the middle have 

 a slight inner cusp, which soon disappears ; the outer cusp is 

 persistent on the admedians and on some of the laterals. 



62. Ariophanta belangeri, Desh. (Helix) in Belanger, Voy. Zool. 



p. 43, pi. 1, figs. 1-3 (1834); Pfr. (Helix) Mon. Hel i, 1847, 



p. 69; id. t. c. vii, 1876, p. 172; H. $ T. (Helix) C. /. 1876, 



pi. 29, fig. 6. 

 Helix bombayana, Grat. Act. Soc. Lin. Bord. xi, 1841, p. 406, pi. 1, 



fig. 1 ; Pfr. Mon. Hel. i, 1847, p. 41 ; id. t. c. iii, 1853, p. 76; id. 



t. c. vii, 1876, p. 125 ; H. $ T. (Helix) C. I. 1876, pi. 29, fig. 5 ; 



E. A. Smith (Xestina), Faun. Geoff. Maid. Lac. Is. 1902, p. 142. 

 Helix vitellina, Pfr. P. Z. 8. 1848, p. 109; id. Mon. Hel. iii, 1853, 



p. 72 ; id. t. c. v'ii, 1876, p. 122 ; H. 8f T. (Helix) C. 1. 1876, pi. 59, 



tigs. 1, 2. 



Shell openly perforate, clepressedly globose, obliquely striated, 

 and more or less decussated by impressed lines (often obsolete) 

 above, smoother below ; pale tawny to purplish or whitish ; spire 

 low, convex, suture impressed ; whorls 5-5|, convex, the last much 

 smaller than in A. semirugata, scarcely descending in front, sub- 

 angulate at periphery ; aperture roundly lunate ; peristome thin, 

 basal and columellar margins slightly reflected. 

 Major diam. 46, min. 37, axis 28 mm. 



Hob. Madura, South Arcot, and Malabar, and probably all the 

 southernmost part of the peninsula. Anaimalai Hills ; N. Mahlor 

 Atoll, Maldives (introduced). 



The recorded locality Bombay is very doubtful. 

 The dimensions above given are those of typical A. belangeri, 

 from Madura : vitellina is a small variety, measuring 29, 24, and 

 18 mm. ; bombayana still smaller (28, 23, 16) ; on the other 

 hand, a very large shell from Gringi, South Arcot, measured no 

 less than 52, 44, and 31 mm. 



A. belangeri may generally be distinguished from A. semirugata 

 by more depressed form, less swollen last whorl, and smaller 

 aperture. Intermediate forms occur. 



