196 AMPHIDUOMUS, GROUP XI. 



ing to the suture above, obsolete on the latter half of the last whorl; 

 cut into oblong spots by a light band revolving midivay between sutures 

 and sometimes a number of other less complete bands; the base en- 

 circled by a brown or purplish band below the periphery and a broad 

 circum-columellar band, brown toward the outer edge, fleshy within ; 

 the space bettveen the two bands and a very narrow umbilical patch 

 yellow. A narroio red band revolves very near the suture, but is re- 

 placed on the earlier whorls by a series of brownish spots ; apex 

 black. Whorls 6^, slightly convex, the last somewhat tapering be- 

 low. Aperture banded or white inside, the peristome reflexed, white; 

 columella dilated and oppressed above, closing or nearly closing the 

 perforation ; parietal callus very thin and transparent. 



Length 32, cliam. 15^, longest axis of aperture 14^ mill. 



Length 31, diam. 16, longest axis of aperture 15 mill. 



Laos Mts., Cambodia (coll. A. N. S. P.)- 



This form differs from xiengensis and nndtifasciatus in the obsoles- 

 cence of the pattern on the last half whorl, and the less interrupted 

 flames. The ground color might be called light fawn rather than 

 buff, especially on the last half whorl of some of the specimens ; the 

 light basal band being yellow. 



Var. TRYONI n. v. PI. 63, fig. 78. 



Similar to var. clausus in the narrow or closed perforation, form, 

 black apex and buffer pale yellow ground-color. Spire pale ; third 

 and fourth whorls with a subsuiural row of brown dots, and several 

 narrow brown lines, continuous or interrupted ; last two whorls with 

 an orange line below the suture ; the base ivith two red-brown or 

 blackish bands, one subperipheral, the other around the columella, a 

 yellow space between them. Columella spreading and rounded above, 

 not in the least grooved at its root. 



Length 32, diam. 15^, longest axis of aperture 14^ mill. 



Length 33, diam. 16, longest axis of aperture 16^ mill. 



Laos Jilts., Cambodia (coll. A. N. S.). 



Somewhat like the smaller A. fultoni in color, but in my opinion 

 allied to the preceding forms, from which it is differentiated chiefly 

 by the total loss of flammules on the last two whorls. The subsutural 

 line has become yellow, as in A. porcellanus, but it is not crowded to 

 the sulure as in that species, but separated therefrom by a pale line, 

 as in xiengensis. In some specimens the lower band is bisected or 

 divided into two bands. Compare A. jiavus var. proximus Fulton, 



