216 HELIC'IDjE. 



Var. theobaldiana, Tapparone Oanefri. 



Helix rotatoria, Theobald, J. A. S. B. xxviii, 1859, p. 318 ; Blanford, 



J. A. S. B. xxxiv, 1865, p. 89 ; Hanley & Theobald, Conch. Ind. 



1870, pi. 15, fig. 5 (non H. rotatoria, v. d. Busch). 

 Helix (Plectotropis) tapeina, var. rotatoria (Buchanan !), Nevill, 



Hand List, i, 1878, p. 74. 

 Helix (Plectotropis) tapeina, var. rotatoria, Tryon, Man. Conch. 



ser. 2, iv, 1888,_p. 54, pi. 12, fig. 77. 

 Helix (Plectotropis) theobaldiana, Tapparone Canefri, Ann. Mus. 



Civ. Geneva, ser. 2, vii, 1889, p. 324. 



I have already shown that the form referred to rotaloria by 

 Theobald is quite distinct from the Java species. Erom typical 

 tapeina it differs in having the whorls flattened, and in the 

 periphery being sharply keeled as far as the aperture. In size it 

 varies considerably like the type, specimens in my possession 

 from Cherrapoonjee, received from a native collector, ranging 

 from diam. maj. 11*5, min. 10*5, alt. 6 mm. to 17 : 15 : 8*5 mm. 



Sab. Burma : Teria Ghat (Theobald), Manwyne and Bhamo 

 (Anderson), Shan Hills, near Ava (Blanford) ; Upper Irrawaddy 

 (Fea). India : Assam (Stoliczka). 



Var. akowtongensis, Theobald. 



Helix akowtongensis, Theobald, J. A. S. B. xxviii, 1859, p. 306. 

 Helix akoutonqensis, Blanford, J. A. S. B. xxxiv, 1865, p. 89 ; 



Hanley & Theobald, Conch. Ind. 1870, pi. 15, fig. 4. 

 Helix (Plectotropis) tapeina, var. akoutongensis, Nevill, J. A. S. B. 



xlvi, 1877, p. 17 ; ibid, in Anderson, Zool. Res. Two Exped. West. 



Yunnan, i, 1878, p. 876 ; ibid., Hand List, i, 1878, p. 74. 

 Helix (Plectotropis) akowtongensis, Tryon, Man. Conch, ser. 2, iv, 



1888, p. 57, pi. 12, fig. 73. 

 Eulota (Plectotropis) akoutongensis, Pilsbry, Man. Conch, ser. 2, ix, 



1895, p. 209. 



Diam. 13-5-14-5, alt. 5-5-6-25 mm. 



Hob. Burma : Akowtong, Pegu, banks of Irrawaddy (Theobald), 

 Thyet Myo (Blanford), Ava and Tsagain (Anderson). 



Differs from typical tapeina in being more depressed in the 

 spire, consequently more widely umbilicated, and in the last 

 whorl being more deflexed in front, while the peripheral keel is 

 also more acute and the aperture more transverse. The elongated 

 granules of the periostracum, moreover, are much more pronounced 

 and coarser. 



Var. perplanata, Nevill. 



Helix (Plectotropis) perplanata, Nevill, J. A. S. B. xlvi, 1877, p. 19 ; 



ibid., Hand List, i, 1878, p. 73 ; ibid, in Anderson, Zool. Res. Two 



Exped. West. Yunnan, i, 1878, p. 878. 

 Helix (^Egistd) perplanata, Nevill, J. A. S. B. 1, 1881, p. 133, pi. 5, 



fig. 21. 

 Helix (Plectotropis) perplanata, Tryon, Man. Conch, ser. 2, 1888, 



p. 57, pi. 13, figs. 49-51. 



