AMPHIDROMUS, GROUP VI. 175 



almost revolute. Columella straightened, hardly twisted, forming an 

 indistinct angle with the basal margin. (Mlldff.) 



Alt. 49, diam. 26 ; length of aperture 23, width outside 17, inside 

 11.5 mill. 



Alt. 43.5, diam. 23.5 ; length of aperture 21, width outside 16.5, 

 inside 1 1 mill. 



Annam : " Mother and cldld " mountain (Roebelen). 



A. metabletus MLLDFF., Nachrbl. d. d. Malac. Gesellsch. xxxii, 

 p. 22 (Feb., 1900). 



'' In this beautiful form I at first thought to recognize A. cochin- 

 chinensis Pfr., known to me by description only ; but that is decidedly 

 narrower, 39 by 17 mill., the ratio of length to breadth being 

 100:43.6, while our new species has the ratio 100 : 53. The spire 

 is riot so straightly conic, the sides being distinctly convex in cochin- 

 c/tineiisis, and moreover Pfeiflfer calls his species smooth and glossy, 

 while A. metablelus is distinctly striate and rather dull, and also Ims 

 fine, close spiral lines. It has also a wider peristome, with thicker 

 lip, and recurved. Mr. Fulton has been so kind as to compare with 

 the type of A. cochinchineusis in the British Museum, and confirms 

 the distinctness of the two, especially on account of the more slender, 

 almost cylindrical contour of PfeifFer's species. The latter has spiral 

 sculpture, but it is hardly visible because the cuticle is nearly worn oH 



Of color- and band-variations it occurs (a) uniform, either pure 

 white or yellow, and (b) banded, on a white or yellow ground." 

 (Mlldff.) ' 



A. INT, ENS Mdllendorff. 



Shell shortly rimate, dextral or rarely sinistral, ovate-conic, solid, 

 lightly plicate-striate, decussated with minute spirals; whitish? 

 Spire high conoid, with convex sides, the apex rather acute. Whorls 

 7, the upper nearly flat, impressed at the sutures, the last encircled by 

 three elevated girdles, of which the median one is wider and higher, 

 below the middle excavated in a rather deep furrow, generally mal- 

 leated in places. Aperture but little oblique, subauriform, the base 

 rather effuse ; peristome widely expanded, strongly thickened, colu- 

 mella nearly straight, strongly thickened with callus above, forming 

 a rather distinct angle with the basal margin ; margins joined by a 

 very thick callus. (Mlldff.) 



Alt. 75, diam. 40 mill. 



