AMPHIDROMUS, GROUP XII. 201 



some details of color pattern. It has not the thickened parietal 

 callus of A. contrarius, but is evidently the form Mousson reported 

 as an immature contrarius from Dompo, near Bima, Sumbawa (not 

 Celebes as Mousson says), having " Ausgezeichnet starker in quadra- 

 tischen Flecken bestehender Zeichnung." 



A. PORCELLANUS (Mousson). PI. 64, figs. 5, 6, 7. 



Shell sinistral, perforate or sometimes closed, long-conic, thin, 

 glossy, striatulate. White or buf, with two broad brown zones on the 

 base and flames or stripes of the same color above and on the spire, cut 

 in the middle by a narrow white spiral band, usually obsolete above 

 this band on the last whorl ; suture narrowly yellow-bordered, a small 

 black-brown dot at the apex. Whorls 6-^-7, convex. Aperture 

 small, banded within ; peristome narrowly reflexed, white'; columella 

 dilated above ; parietal callus scarcely visible. 



Alt. 33, diam. 14^. longest axis of aperture 14^ mill. 



Alt. 30, diam. 14^, longest axis of aperture 13^ mill. 



Alt. 27, diam. 13^, longest axis of aperture 12 mill. 



Western Java : Warong Kapqngdangan f (v. Hasselt); Buitenzorg 

 (Weber, Strubell). Sumatra : Deli, on the north coast (Leop. Mar- 

 tin). 



Bulimus zebra VAN HASSELT, Algemeerie Konst en letterbode, 

 1823, p. 233 (no description), and an unpublished plate 13, f. 1, 

 copied in Schlegel's Handleiding, atlas, Weekdieren, pi. 1, f. 10. 

 Not B. zebra Brug Bulimus pore ellanus MOUSSON, Die Land- und 

 Siisswasser-Mollusken von Java, p. 33, 110, pi. 3, f. 4 (1849). 

 PFR., Monogr. iii, p. 328 ; iv, 384 ; vi, 32 ; Conchyl. Cab., p. 138, 

 pi. 41, f. 14, 15 (?). MARTENS, Ostas. Landschn., p. 365. Amphi- 

 dromus porcellanus (Mouss.). MARTENS in Weber's Zool. Ergebnisse, 

 ii, p. 241 WIEGMANN, in the same work, vol. iii, p. 204, pi. 15, f. 

 2-11 (anatomy). BOETTGER, Bericht Senck. Naturforsch. Ges., 

 1890, p. 146. 



This species differs from A. contrarius in its thin parietal film, 

 without a denticle above. In color-pattern it is much like the larger 

 and more ventricose A. poecilochroa, though the lower band is wider 

 and extends to the root of the columella. The chief variation is in 

 the flames or stripes of the last whorl, which may be narrow and 

 extend upward nearly to the suture, or short, even completely want- 

 ing. This is sufficiently shown in the figures. The length of the 

 shell varies more than the diameter. 



