172 AMPH1DROMUS, GROUP VI. 



developed, rarely wanting ; apex white or yellowish. Whorls 7, the 

 earlier without streaks or hands. Outer lip reflexed, recurved, 

 adnate to the back of the Up or imperfectly so, the adnate edge fre- 

 quently brown or even blackish bordered. Parietal and columellar 

 callus pure white throughout, broadly spreading, extending well 

 downward ; columella straight, or somewhat folded, stout. 



Alt. 55, diam. 29, longest axis of aperture 30 mill, (dextral.) 



Alt. 56, diam. 27-J, longest axis of aperture 27J mill, (sinistral). 



Alt. 60, diam. 29, longest axis of aperture, 30 mill, (dextral). 



Alt. 53, diam. 30, longest axis of aperture, 27^ mill, (sinistral). 



Alt. 44, diam. 23^, longest axis of aperture 23 mill, (sinistral). 



Singapore (" Magenta" voyage) ; Saigon (Couriillon) and Prov. 

 Bate, Cochin China. 



Cochlostyla polymorpha T.-C., Zoologia del Viaggio intorno al 

 Globo della R. Fregata Magenta, Malacologia, p. 82, pi. 2, f. 4 

 (1874); G. polimorpha in expl. of plate Bulimus polymorphic 

 PFR., Monogr. viii, p. 23. Amphidromus polymorphus DE MORGAN, 



Bull. Soc. Zool. Fr. 1885, p. 387 FULTON, Ann. Mag. N. H. (6) 



xviii, 71 ANCEY, Ann. Mus. d'Hist. Nat. Marseille, Ser. 2, Bull., i, 

 p. 141. 



Of 13 specimens before me, 8 are dextral. Canefri based the. 

 species upon 3 specimens, two of them sinistral. I very much doubt 

 the locality "Singapore;" probably the original specimens were 

 brought there from Cochin China, which is the locality of some five 

 lots of the species I have seen from various sources. It differs from 

 comes in being more solid^in the color-pattern, especially the absence 

 of spiral bands on the spire, and in having black varices, also in the 

 more or less adnate outer lip. In this respect it stands between 

 comes and dohrni. 



When denuded of cuticle the markings are seen to be reddish or 

 purplish brown ; and the same color is prominent inside the aperture 

 in young shells. Each varix is usually preceded by a yellow and 

 followed by a whitish stripe, and usually the reddish flammules are 

 narrower and closer before than after a varix. The last whorl occa- 

 sionally has a dark spiral band, or traces of a pale peripheral band. 

 There seems to be always a small white basal patch, but on some 

 shells the pale stripe behind the lip is wanting, though it is as con- 

 spicuous in some others as in A. comes. 



Var. polymorphus was figured in Ferussac, pi. 161, f. 3, 4, but ap- 



