AMPHIDROMUS, GROUP VI. 169 



straight] y 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 snbsutural band and the base. Whorls 0-(> j, but 

 slightly convex. Aperture white within, the edge of the li[> dark ; 

 parietal wall blackish-chestnut with a marginal white callus. 



Alt. 38, diam. 23^, aperture 2<H mill. 



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



Alt. 33, diam. 20^ mill. 



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

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

 Bnlimus inversus Miill., 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- 

 in<r to Fulton, "the small form has been found at Sarawak and Sir- 



o 



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



Subsp. ANNAMITICUS (Crosse & Fischer). PI. 56, fig?. 98, 99, 100. 



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

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

 Whorls 77-^, the earlier 2 convex, several succeeding ivhorls ahnost 

 fat, slightly ntarginate 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 within. 



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



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

 and the Fayen-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). 



Bulinms annamiticus CROSSE & FISCHER, Journ. de Conchyl. 

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

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



