142 AMPHIDROMUS, GROUP IV. 



The distribution and chief or typical characters of the members of 

 the perv ersus group are as follows: 



a. Peristome reflexed, more or less adnate, thick, and usually dark- 

 edged behind in adults; dark varices usually present ; im perforate 

 or nearly so. 



b. Yellow, with or without dark varices, but not flammulate ; 



rarely white. per versus, p. 147. 



b l . Yellow, often greenish below, with or without brown streaks 



interrupted by a median light girdle : solid, rather straightly 



conic. Celebes, Borneo, Java. interruptus, p. 150. 



b'*. Yellow, with broad zigzag or straight stripes and a median 



golden girdle ; ventricose and thin. S. Celebes. 



sultanvt, p. 154. 



b*. Pallid, copiously streaked and with black varices the streaks 



not interrupted; outer lip narrow, mostly adnate; form 



narrow and high ; often perforate. emaciatus, p. 153. 



a 1 . Peristome not adnate behind, not dark-edged ; no dark varices ; 



shell not distinctly streaked or banded. 



b. Imperforate, yellow or white, sinistral, solid ; yellow inside 



except in white shells. Palawan, etc. entobaptus, p. 145. 



b\ Imperforate or nearly so, rather thin, glossy, yellow, the 



peristome narrow, white. Java. alticola, p. 147. 



b' 1 . Perforate or umbilicate, more or less distinctly decussate, 



uniform or somewhat streaked. Mindanao, Sulu Is. 



chloris, p. 142; roeseleri, p. 142. 



A. CHLORIS (Reeve). PI. 50, figs. 28-38. 



Shell usually sinistral, umbilicate or rimate, oblong-ovate, variable 

 in color, but typically clear bright yellow, with a narrow pale or 

 white band below the suture; no dark varices; solid, smoothish, 

 being weakly striatulate and faintly striate spirally. Spire long, a 

 little convexly conic, the apex obtuse, whitish. Whorls 6-^, but 

 slightly convex, hardly compressed below the sutures. Aperture 

 small, ovate, white or slightly rufous yellowish tinted within ; peri- 

 stome white throughout, the outer lip thickened, reflexed and recurved 

 but not adnate behind, the edge white ; columellar margin dilated 

 above, with a thickened white edge passing up the parietal margin 

 some distance ; the parietal callus elsewhere translucent and showing 

 the underlying color, rarely thicker and whitish. 



