. Mollusca ... 60. Ariophanta thyreus, Bs. (Helix) A. M. N. H. (2) ix. 1852,p. 405; Pfr. (Helix) Mm. Hel. iii, 1853, p. 251; id. t. c. vii,1876, p. 454; S. 8f T. (Helix) C. I. 1876, pi. 27, fig. 6; Mai. Soc. iv, 1901, p. 244. Helix ryssolemma, Albers, Zeitsehr. 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 5-5| whorlsincreasing mo
. Mollusca ... 60. Ariophanta thyreus, Bs. (Helix) A. M. N. H. (2) ix. 1852,p. 405; Pfr. (Helix) Mm. Hel. iii, 1853, p. 251; id. t. c. vii,1876, p. 454; S. 8f T. (Helix) C. I. 1876, pi. 27, fig. 6; Mai. Soc. iv, 1901, p. 244. Helix ryssolemma, Albers, Zeitsehr. 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 5-5| whorlsincreasing more slowly, so that the mouth is comparatively muchsmaller, and by the distinctly decussated sculpture above. The. Fig. 20.—Ariophanta thyreus. suture is scarcely impressed, except towards the mouth ; spirelow, convex. Colour brown horny, with generally a narrow darkrufous baud below the subangulate periphery. The peristome isblunt and frequently thickened. Major diam. 33, min. 28, axis 16 mm. A large specimenmeasures 40, 34, and 21 mm. Animal brownish grey, mantlepaler. Hah. Brahmageri (Coorg); Nilgiri, Anaimalai and BalarangamHills, S. India. Intermediate forms between this shell and A. cysis occur. A. hetercea is one of these intermediate forms. It is lessdepressed and thinner than typical thyreus, and more narrowlyumbilicated, the sutures are deeper and the sculpture not decus-sated. The colour is paler brown, and the narroiv reddish bandbelow the periphery is very distinct. Major diam. 37, min. 30, axis 21 mm. Hah. Sispara, west side of Nilghiris. A. ryssolemma (rhysolemma) is a large variety n ith coarse sculp-ture, measuring 40,33, and 19 mm. Specimens collected at SisparaGhat, Nilgiri Hi
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