34 ZONITID^. 



tinuous with the main sheath below. At the junction of these 



two parts is the kale-sac on a very short tube which the vas 



defereiis joins. It is thus strikingly similar to the same part 

 in the genus Ratnadvipia.~] 



60. Ariophanta thyreus, Bs. (Helix) A. M. N. H. (2) ix. 1852, 

 p. 405; Pfr. (Helix) Mon. Hel iii, 1853, p. 251; id. t. c. vii, 

 1876, p. 454; H. $ T. (Helix) C. I. 1876, pi. 27, fig. 6; Elf. 

 Proc. Mai Soc. iv, 1901, p. 244. 



Helix ryssolemma, Albers, Zeitschr. Mai. 1852, p. 186; Pfr. 

 (Helix) Mon. Hel. iii, 1853, p. 634 ; id. Nov. Conch, i, 1854, p. 37, 

 pi. 10, figs. 13, 14. 



Ariophanta hetersea (subsp.), Blf. Proc. Mai. Soc. iv, 1901, p. 248, 

 pi. 25, fig. 2. 



Shell depressed, rather more widely umbilicated than A. cysis, 

 and distinguished from that species by having 5-5J whorls 

 increasing more slowly, so that the mouth is comparatively much 

 smaller, and by the distinctly decussated sculpture above. The 



Fig. 20. Ariophanta thyreits. 



suture is scarcely impressed, except towards the mouth ; spire 

 low, convex. Colour brown horny, with generally a narrow dark 

 rufous band below the subangulate periphery. The peristome is 

 blunt and frequently thickened. 



Major diam. 33, min. 28, axis 16 mm. A large specimen 

 measures 40, 34, and 21 mm. Animal brownish grey, mantle 

 paler. 



Hob. Brahmageri (Coorg) ; Nilgiri, Anaimalai and Balarangam 

 Hills, S. India. 



Intermediate forms between this shell and A. cysis occur. 



A. hetercea is one of these intermediate forms. It is less 

 depressed and thinner than typical thyreus, and more narrowly 

 umbilicated, the sutures are deeper and the sculpture not decus- 

 sated. The colour is paler brown, and the narrow reddish band 

 below the periphery is very distinct. 



Major diam. 37, min. 30, axis 21 mm. 



Hob. Sispara, west side of Nilghiris. 



A. ryssolemma (rhysolemma} is a large variety uith coarse sculp- 

 ture, measuring 40, 33, and 19 mm. Specimens collected at Sispara 

 G-hat, Nilgiri Hills, agree with the description. 



