214 HELICID^. 



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 squamae 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. 



Fig. 83. — Plectotropis nutans. 

 (From Proc. Malac. Soc. 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 Lt. -Col. Godwin-Austen, labelled "Habi- 

 ang, Garo." 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, p. 352; ibid., A. M. N. H. 



ix, 1842, p. 486 ; Reeve, Conch. Icon, vii, 1852, pi. 125, fig. 750 ; 



PfeifFer, Conch.-Cab.. 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, fig. G ; Nevill in Anderson, Zool. Bes. 



Two Exped. West. Yunnan, i, 1878, p. 876. 

 Helix Imttoni, var. tapeina, Godwin-Austen, J. A. S. B. xlv, 1876, 



p. 312. 

 Helix {Plectotropis) tapeina, Nevill, Hand List, i, 1878, p. 74 ; 



Tapparoue Canefri, Ann. Mus. Civ. Genova, ser. 2, vii, 1889, 



p. 324 ; Tryon, Man. Conch, ser. 2, iv, 1888, p. 53, pi. 12, 



fig. 71. 

 Eidota {Plectotropis) tapeina, Pilsbry, Man. Conch, ser. 2, ix, 1896, 



p. 209. 



Original description : — " Testa subconoidea, supra convexa, 

 subtus tumida ; epidermide minutissime corrugata ; periphseria 

 angulata, peristomate non continuo, subreflexo. Umbihco medi- 

 ocri, prof undo ; omnes anfractus exhibente." {Benson.) 



"Diam. 0-6 polh [ = 15 mm.]." 



