AMPHIDROMUS, GROUP VI. 167 



flammules ; spire elongate, the suture very minutely crenulate ; 

 whorls 7, subconvex, the last 4 sutured with intense black, last whorl 

 compressed at the base ; aperture broadly subquadrangular, some- 

 what twisted at the columella ; peristome straight, white, callous, 

 expanded throughout ; columellar margin strongly calloused, re- 

 curved, violaceous. Length 66, diam. 22, length of aperture 30, 

 width 14 mill. (Rochebr.} 



Mountains of Chaudoc (Dr. Harmand). 



A. nigrofilosus ROCHEBR., Bull. Soc. Philomath, vi, 1881-2, p. 72. 



Said by Mr. Fulton to be identical with A. maculiferus var. 

 gracilior ; if so, a Philippine shell must have become mixed with 

 Harmand's Cambodian collection. See p. 132. 



A. INVERSUS (Mu'ller). PI. 56, figs. 91, 92. 



Shell either sinistral or dextral, perforate, ovate-oblong, striatulate, 

 slightly shining ; whitish, irregularly streaked with chestnut, the whole 

 color abruptly becoming darker chestnut below the periphery ; the 

 upper whorls whitish with a purple band above the suture. Whorls 

 about 7, slightly convex. Aperture .quite oblique, ovate, white 

 within the outer lip, the parietal wall dark brown with a white mar- 

 ginal callus ; peristome rather thick, white, reflexed, the recurved edge 

 brown, not adnate. Columella straight and vertical ; parietal callus 

 moderately heavy. 



Alt. 55, diam. 27, longest axis of aperture 26 mill. 



Malay Peninsula (Wallace) : Malacca (F. Jagor), Singapore 

 (Martens, 'Magenta'). Sumatra (Hombron & Jacquinot), at the 

 assistant residency Agam, on the west coast (Dr. Ludeking). Sunda 

 Strait islands Pulo Sangiau and Rakata (Zollinger). Borneo: 

 Coast of Sambas (Hallier) ; Smitau on the Kapoeas River, and 

 Roema Manoeal on the southern foot of Mt. Kenepai (Biittikoper); 

 Mt. Dadap (Moret); Sintang (Goedhuis). 



Helix inversa MULL., Verm. Terr, et Fluv. Hist., ii, p. 93, 1774. 

 (Chemnitz, Conchyl. Cab., ix, pi. 110, f. 925, 926. and edit, nov., 

 pi. 6, f. 1, 2). FER., Prodr., no. 414, exclusive of var.; Histoire, 

 pi. 161, f. 1, 2. Bulimus inversus BRUG., Encycl. Meth., i, p. 315. 

 LAM., An. s. Vert., vii, p. 118; edit. Desh., viii, p. 224. 

 MOUSSON, Moll. Java, p. 107, exclusive of variety PFR., Zeitschr. 

 f. Malak., 1849, p. 133 (var. a and e) ; Monogr. iii, p. 318, excl. of 

 var. B. MARTENS, Ostas. Landschn., p. 337. Amphidromus in- 



