AMPHIDKOMUS, GR9UP VI. 169 



straightty conic, not swollen. Ground-color whitish, the base chestnut 

 or tawny, and with a band of the same color below the suture', heavily 

 streaked with chestnut, the streaks intermingled dark and lighter, 

 and intensified on the subsutural band and the base. Whorls 6-6-|, but 

 slightly convex. Aperture white within, the edge of the lip dark ; 

 parietal wall blackish-chestnut with a marginal white callus. 



Alt. 38, diarn. 23^, aperture 20 mill. 



Alt. 45, diam. 24^, longest axis of aperture 23 mill. 



Alt. 33, diam. 20J mill. 



Bulimus andamanensis Mousson MSS., PFR., Novitates Conch, 

 iv, part 39, p. 35, pi. 116, f. 7-10 (1871); Monogr. viii, p. 39. 

 Bvlimus inversus Mull., GASSIES, Faune Terr. Nouvelle-Caledonie 

 i, p. 50, pi. 3, f. 3, 4 ; Cf. CROSSE, J. de C., 1894, p. 171. 



This is a small form of inversus with certain peculiarities of the 

 more intense color pattern which probably define a geographic race. 

 It was originally supposed to be from the Andaman Is., but no 

 Amphidromus has been found there by recent collectors. Accord- 

 ing to Fulton, ' the small form has been found at Sarawak and Sir- 

 hassen (Natuna Is.) by Mr. Everett." 



Subsp. ANNAMITICUS (Crosse & Fischer). PL 56, figs. 98, 99, 100. 



Dextral, imperforate, with thick, slightly convexly conic spire, 

 which is pink above, with a purple suprasutural band near the apex. 

 Whorls 7 7-J, the earlier 2 convex, several succeeding whorls almost 

 flat, slightly marginate above the sutures ; the last 2 whorls more con- 

 vex, pale brown with some oblique chestnut streaks, the last whorl 

 abruptly becoming darker chestnut beneath ; one varix or none. 

 Aperture white within, the recurved edge of the peristome dark. 

 Parietal callus white, becoming thin and showing the chestnut color 

 of the base w r ithin. 



Alt. 50, diam. 27, longest axis of aperture 26^ mill. 



Cambodia: Vicinity of the town of Saigon (Michau, Counillon), 

 and the Fuyen-Moth district, on trees (Le Mesle, A. Michau) ; 

 everywhere in Cambodia, on trees bordering the rice fields (Pavie). 

 Annam : Boloven Plateau, in western Annam, on the left bank of the 

 Mekong (C. Roebelen). 



Bulimus annamiticus CROSSE & FISCHER, Journ. de Conchy]. 

 1863, p. 357; 1864, p. 329, pi. 12, f. 8. PFR., Monogr. Hel. Viv., 

 vi, p. 19. MORELET, Series Conchyliologiques iv, p. 261 (1875). 



