AMPHIDROMUS, GROUP XI. 199 



p. 172, pi. 46, f. 11, 12 ; Monogr. vi, p. 33. Amphidromus areolatus 

 Pfr., FULTON, Ann. Mag. N. H. (G), xvii, p. 81. 



'' A thin shell somewhat like porcellan-us, but with close forked 

 markings on the upper whorls" (Fulton). 



A. ZEBRINUS (Pfeiffer). PI. 63, figs. 90, 91. 



Shell sinistral, subperforate, oblong-conic, rather solid, lightly 

 striate ; white, closely painted with rather wide, nearly straight or some- 

 ivhat waved black-brown stripes. Spire slender, conic, the vertex a 

 little acute, and black ; suture shallow, white. Whorls 6^ the upper 

 convex, the rest slightly so, last whorl two-fifths the total length, a 

 trifle tapering below. Columella subinflated, rather straightly re- 

 ceding. Aperture oblique, semi-oval ; peristome simple, rather 

 broadly expanded, the columellar margin reflexed, overhanging. 

 Length 25, diam. above aperture 10^, length of aperture 11 mill. 

 (Pfr), Siam (Mouhot). 



Bidimus zebrinus PFR., P. Z. S., 1861, p. 194; Novit. Conch., 

 p. 172, pi. 46, f. 9, 10 ; Monogr. vi, p. 32 Amphidromus zebrinus 

 Pfr., FULTON, Ann. Mag. N. H. (6), xvii, 1896, p. 81. 



Var. EUDELI Ancey. PI. 63, figs. 87, 88. 



Shell sinistral, rather solid, oblong-conic, obliquely striate, 

 narrowly rimate ; spire conic, apex dark brown; whorls 7, convex, 

 the first ones dull while, the fourth and lower ones cream, with 

 oblique bluish-gray stripes, becoming reddish-brown on the spire, 

 interrupted at the middle on the penultimate and preceding whorls 

 by a submedian li^ht spiral line, and evanescent at the suture ; last 

 half-whorl bluish-gray, with a cream-yellow band around the middle 

 of the base, and an umbilical area of the same tinge ; a narrow 

 infra-sut ural line of a reddish-brown color on the last and penultimate 

 whorls. Aperture small, oblique, expanded, interior greyish. Colum- 

 ella thick, reflected, paler at the upper part. Lip thickened, dark- 

 brown externally, purple inside, particularly so near the umbilicus. 



Length 28, diam. 14, length of aperture 11 mill. (Ancey). 



Length 26, diam. 12^, length of aperture 12 mill, (specimen). 



Annam: near Binh-Dinh, in forests (E. Eudel). 



A. eudeli ANC., Nautilus xi, p. 63 (Oct. 1, 1897). A. zebritms 

 subsp. fuscolabris MLLDFF-, Nachrbl., 1898, p. 75. 



This is allied to A. zebrinus Pfr., but is apparently larger and 



