AMPHIDROMUS, S.-G. BEDDOMEA. 3 



" In view of the general agreement, it scarcely seems well-advised 

 to accord Beddomea higher rank than that of a subgenus of Amphi- 

 dromus. None of the three structural differences mentioned is of 

 much importance, though I do not doubt that they will prove ; con- 

 stant in Beddomea. When some of the species of Amphidromus 

 which are conchologically nearest Beddomea (such as A. sylheticus) 

 come to be examined, transitions may not unlikely be found in the 

 dentition. In the long flagellum, Beddomea is more like the lajrger, 

 amphidrome species of Amphidromus than the smaller, invariably 

 sinistral species, which so far as known, have this organ much 

 shorter." (H. A. P., Proc. Malac. Soc. Lond. vi, p. 160.) 



Key to Species of Beddomea. 

 I. Solid and opaque, variegated with brown bands or stripes. 



trifasciatus, p. 3. 

 II. Rather thin, very pale or white, without dark markings. 



a. Periphery rounded or but slightly angular ; Ceylon : 



ceylanicus, p. 5 ; S. India : physalis* p. 8. 

 a. 1 Periphery strongly carinate ; dextral, Ceylon. 



albizonatus, p. 7. 

 a 2 Periphery strongly carinate ; sinistral ; Travancore. 



calcadensis, p. 9. 



A. TRIFASCIATUS (Gmelin). PL 1, figs. 1-6, 8. 



Shell dextral, compressed-umbilicate, thin but moderately strong, 

 whitish with three brown spiral bands, the upper one often inter- 

 rupted, faint or wanting, or with two wide bands separated by a light 

 zone at the periphery; the spire white or streaked. Surface somewhat 

 glossy, slightly striate, and under a lens showing a minute punctula- 

 tion on the spire, wanting on the last and usually on the next to the 

 last whorls. Spire conic, the apex very obtuse ; whorls about 5, 

 slightly convex, the last rounded at the periphery and beneath. 

 Aperture oblique, ovate, white with dark markings within ; lip re- 

 flexed, white, the columellar margin triangularly dilated. 



Alt. 27, diam. 16, longest axis of aperture 13.5 mm. 



Alt. 28, diam. 14.5, longest axis of aperture 13 mm. 



Ceylon. 



Helix trifasciata tranguclarica CHEMNITZ, Conchyl. Cab. ix, pt. 

 2, p. 155, pi. 134, f. 1215 Helix trifasciata GMEL., Syst. Nat. (13), 



