174 AMPHIDROMUS, GROUP VI. 



A. MCNDUS (Pfeiffer). PI. 61, figs. 57, 58, 59. 



Shell im perforate, ventricose-ovate, rather solid, nearly smooth, 

 uniform white, glossy, without cuticle. Spire convexly conic, the 

 apex somewhat teat-shaped ; suture simple, whorls 6 3 a little convex, 

 the penultimate one subangulate, last whorl slightly shorter than the 

 spire, colurnella vertical, somewhat compressed. Aperture oblique, 

 oval, somewhat effuse at base ; peristome slightly thickened, nar- 

 rowky expanded and reflexed, the margins joined by a thin callus; 

 columellar margin dilated, adnate. Length 35, diam. 19, aperture 

 17 mill, long inside (Pfr.). 



Singapore (Gruner. type) ; Borneo? (Coming)'. 



Bulimus mundus PFR., Zeitschr. f. Malak., 1853, p. 57 ; Conchyl. 

 Cab., p. 261, pi. 70, f. 21, 22; Monogr., iii, p. 651 ; viii, p. 24. 

 Amphidromus mundus Pfr., FULTON, Ann. Mag. (6), xvii, p. 71. 

 This work, vol. viii, pi. 11, f. 20 (not good). 



I have given Pl'eiffer's description and figures (f. 57, 58), as well 

 as his apochryphal localities. The specimens before me agree with 

 his, part being from an unknown locality, part marked "Philip- 

 pines." They are either dextral or sinistral, glossy white through- 

 out, rather swollen, the 3ubangular periphery of the penult, whorl 

 visible at the suture. The lip is moderately thickened on its face, 

 and is narrowly recurved but not adnate. From the whiteness of 

 the parietal wall I conclude that there is no colored cuticle; in fact 

 the specimens before me have no appearance of being denuded of 

 their cuticle. Pfeiffer mentions larger specimens, u giganteus, dex- 

 trosus, long. 50, diam. 23 mill. Nova Caledonia? Mus. Cuming;" 

 and these are also probably what Fulton refers to. The name alludes 

 to its clean, white appearance. 



A. METABLETUS Mollendorff. 



Shell imperforate, dextral or sinistral, ovate conic, rather solid, 

 decussated throughout with minute but distinct spiral lines, scarcely 

 shining ;. white or yellow, uniform or ornamented with three brown 

 bands, at suture, periphery and around the columella. Spire almost 

 regularly conic, the sides nearly straight, apex obtuse. Whorls 7^, 

 the upper 5 nearly Hat, lower ones a little convex, separated by a nar- 

 rowly pale margined suture, the last whorl about two-fifths the total 

 alt. Aperture moderately oblique, oval, slightly excised, somewhat 

 effuse at base ; peristome moderately expanded, thickened, refiexed, 



