AMPHIDROMUS, GROUP XI. 195 



flames cut by a median yellow spiral, its lower or basal part having 

 three concentric zones (a yellow one between two brown ones). 

 Aperture suboval, somewhat angular below, whitish inside, the 

 margins joined by a very thiu and transparent callus ; columella 

 thick, rounded, white ; lip widely reflexed, white. Length 38, diam. 

 17^-18, length of the aperture 14-16 mill (Morlet). 



Laos : Plateau of Xieng-Moi, and the forest on the banks of the 

 Menam-Pinh (Pavie) ; Luang-prabang (Counillon) ; Prang (W. L. 

 Abbott). 



Amphidromus xiengensis L. MORLET, Journ. de Conchyl., 1891, 

 p. 27, 232, 240, pi. 5, f. 4. Ancey, Ann. Mus. d'Hist. Nat. Mar- 

 seille (Ser. 2), Bulletin, i, 1898, p. 134. DALL, Nautilus, xi, p. 37. 

 A. porcellanus var. xiengensis Morlet, FULTON, Ann. Mag. N. H. 

 (6), xvii, p. 79 (1896). 



Very closely allied to the Javan A. porcellanus, but somewhat 

 more solid and a little larger, with a subsutural series of dots on the 

 upper whorls and a reddish line below the narrow pale sutural border 

 on the last whorl. The dark apical dot is also larger. I am quite 

 unable to agree with Fulton in his reference of this form and multi- 

 fasciatus to porcellanus and contrarius respectively. Unless the 

 whole porcellanus group be lumped, as some authors have treated the 

 perversus group, the present species (as herein constituted to include 

 color-varieties) has as good a right to stand as any of those recognized. 



Ancey reports specimens less elongated than the figured type, but 

 agreeing with it in coloration and other characters. 



I suppose "A. porcellanus Mouss." of Rochebrune (Bull. Soc. 

 Philomathique de Paris, vi, 1881-2, p. 71), from the forests of 

 Owglu, Cochinchina, collected by M. Pierre, is really xiengensis. 



Var. multifasciatus Fulton. PI. 63, fig. 77. 



" Like maculatus, but more solid ; the umbilicus almost covered. 

 Pale lemon color, with oblique brown stripes interrupted by three or 

 four narrow yellow bands; a narrow red band just below and encirc- 

 ling the suture " (JFW&on). Cambodia (British Museum). 



A. contrarius var. multifasciata FULTON, Ann. Mag. N, H. (6), 

 xvii, p. 78, pi. 7, f. 5 (January, 1896). 

 Var. clausus n. v. PL 63, figs. 79, 80, 81, 82. 



Imperforate or nearly so, sinistral, thin but moderately solid, glossy, 

 striatulate. Buff, with oblique or longitudinal brown flames not reach- 



