168 AMPHIDROMUS. 



A. RHODOSTYLUS Mollendorff. 



Shell sinistral, rimate, long ovate-conic, rather solid, delicately 

 striatulate, microscopically decussate spirally, opaque; usually yel- 

 low, unicolor or variously marked (see below). Spire rather long 

 with straight sides. Whorls 7, the upper ones flat, penultimate a 

 little convex, the last whorl moderately convex, separated by a brown- 

 lined suture. Aperture moderately oblique, somewhat ear-shaped ; 

 peristome a little expanded, slightly reflexed ; columella straight, 

 rose-tinted, forming a more or less distinct angle with the base. 

 Length 38-45.6, diam. 20-21.4 mill. (Mlldff.}. 



Color-forms: A. (simplex), uniform yellow, with only a brown 

 sutural line and browner umbilical spot ; sometimes a few green 

 bands near the end of the whorl. B. (roseolineata), having a narrow 

 reddish adjoining the sutural band below ; the last whorl reddish 

 towards the aperture. C. (nigrolineata), umbilical zone wider; a 

 black-brown band below the periphery. D. (ignea), upper whorls 

 streaked with dark brown, the last whorl fire-red, with fading black- 

 ish streaks. E. (rhabdota), broad brown streaks fading towards the 

 aperture. F. (bipartita), like color-form E, but the last whorl 

 greenish-brown below by the confluence of streaks, this nearly uni- 

 colored zone bounded above by a sharp line. G. (subconfluens) r 

 streaks confluent, the last two whorls uniform brown, verging towards 

 greenish or reddish. The last three forms intergrade. (Mlldff.} 



Pharang, Southern Annam (Fruhstorfer). 



Amphidromus rhodostylus MLLDFF., Nachbl. d. D. Malak. Ges., 

 1901, p. 47. 



This Protean species assimilates best with the Group of A. 

 mouhoti Pfr., though not the entire peristome, but only the columella 

 is colored reddish. (Mlldff.}. 



Group of A. janus (Vol. xiii, p. 156). 

 A. METABLETUS Mlldff. PI. 49, figs. 1, 2, 3, 4. 



As Dr. von Mollendorff has pointed out, this species seems more 

 allied to the janus group than to that in which I placed it, Manual 

 xiii, p. 174, before I had seen specimens. It is now for the first 

 time figured, the specimens being from the type locality. Dr. von 

 Mollendorff has described two races in addition to the type form, in 

 Nachbl. d. D. Malak. Ges. 1901, pp. 48-50. 



Subsp. pachychilus v. Mlldff. Stronger-shelled throughout,. 



