. Mollusca ... Mollusks. 214 HELIOIDJE. In shape P. nutans somewhat resembles the var. tlieohaldiana of P. tapeina, but the shell is much thinner, the whorls are more flattened above and less tumid below, the keel is more pronounced and pinched and the aperture quite different. The principal char- acter, however, separating it from P. tapeina and its varieties lies in the absence of cuticular granules or squamaa and in the deciduous cuticle. I found specimens in Mr. Leman's collection and in the British Museum—both the Blanford and the general collection— with the MS. name Trachia nutans, Blf.
. Mollusca ... Mollusks. 214 HELIOIDJE. In shape P. nutans somewhat resembles the var. tlieohaldiana of P. tapeina, but the shell is much thinner, the whorls are more flattened above and less tumid below, the keel is more pronounced and pinched and the aperture quite different. The principal char- acter, however, separating it from P. tapeina and its varieties lies in the absence of cuticular granules or squamaa and in the deciduous cuticle. I found specimens in Mr. Leman's collection and in the British Museum—both the Blanford and the general collection— with the MS. name Trachia nutans, Fig. 83.—Plectotropis nutans. (Prom Proc. Malao. Soo. London.) The specimen in the general collection is a trifle larger, measuring 18 mm. in diameter, and more solid, while the last whorl descends for a considerable distance, but this does not seem to me to be a normal feature. Mr. Ponsonby possesses two specimens, received from G-odwin-Austen, labelled "Habi- ang, ; One of these also measures 18 mm. in diameter and it has the aperture more dilated and the basal and columellar margins more curved than the other specimens I have seen. 187. Plectotropis tapeina, Benson. Helix tapeina, Benson, J. A. S. B. v, 1836, ; ibid., A. M. N. H. ix, 1842, p. 486; Eeeve, Oonch. Icon, vii, 1852, pi. 125, %. 750; Pfeiffer, , Helix, iii, 1854, p. 334, pi. 131, figs. 14,15; Blanford, J. A. S. B. xxxiv, 1865, p. 89 ; Hanley & Theobald, Conch. Ind. 1870, pi. 15, flg. 6 ; Nevill in Anderson, Zool. Res. Two Exped. West. Yunnan, i, 1878, p. 876. Helix huttoni, var. tapeina, Godwin-Austen, J. A. S. B. xlv, 1876, p. 312. Helix {Plectotropis) tapeina, Nevill, Hand List, i, 1878, p. 74; Tapparone Canefri, Ann. Mus. Civ. Genova, ser. 2, vii, 1889, p. 324 ; Tryon, Man. Conch, ser. 2, iv, 1888, p. 53, pi. 12, tig. 71. Eulota (Plectotropis) tapeina, Pilabry, Man. Conch, ser. 2, ix, 1895, Original description :—" Testa subconoidea, supra eonvexa, subt
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