AMPIIIDROMUS, GROUP IV. 147 



reaches to Balabac Strait, being enumerated by Mr. Smith among 

 Everett's Balabac shells. 



A. ALTICOLA. 'Boettger' Fulton. PI. 53, figs. 75, 76. 



Shell imperforate or nearly so, oblong-ovate, either dextral or 

 sinistral, rather thin, glossy, striatulate, and having extremely fine 

 spirals; yellow, with a narrow whitish subsutural band. Spire 

 straightly conic, the apex whitish, obtuse; whorls 5|. the earlier 

 white with a gray band below. Aperture oblique, pale yellowish 

 within, the peristomen arrow, white, subreflexed ; columella straight, 

 rather thin ; a translucent film across the parietal wall. 



Alt. 37, diam. 20 mill. (type). 



Alt. 34, diam. 18, longest axis of aperture 18 mill. Java. 



A. alticola (Boettger MSS.) FULTON, Ann. Mag. N. H. (6), xvii, 

 p. 70, pi. 6, f. 5, 5 (January, 1896). 



' Easily separated from all other known species of this group by 

 its small size, narrow form and thin substance." The lip is quite 

 narrow, and expanded rather than refiexed. 



A. rKiivKiisus (Linne). PI. 51, figs. 47-;V2. 



Shell rather solid, imperforate or nearly so, smoothish, striatulate, 

 clear yellow, uniform, or ivith one (more rarely several) blackish 

 variceal stripes; no pale border below the suture. Whorls 6-6^, 

 slightly convex, the last rather inflated. Aperture white throughout, 

 the lip thick, white, revolute, and adnate behind, where it is edged 

 with black-brown, in adult specimens. 



Alt. 46, diam. 26, longest axis of aperture 25 mill. 



Southern peninsula of Ot lebcs ; Java; a variety in Borneo. 



Helix perversa L., Syst. Nat. x, p. 772, exclusive of all references 



except those to Gualtieri and Argenville (1758) Helix sinistrn, 



var. a and b, MOLL., t. c., p. 90. Helix dextra, var. a and b, 



MULLER, Verm. Terrestr. et Fluv., ii, p. 89 (1774). MA WE, The 



Linn. Syst. of Conch., p. 161, pi. 29, f. 1 (1823) Bulimus dexter 



Mull, (in part), DESK, in Fer., Hist., p. 22, pi. 148, f. 3 (??). 

 Hiili'mus citrinus BRUGUIERE, Encycl. Metli., p. 313, exclusive of 

 var. and D (1792). CROUCH, Illustr. Intro, to Lam. Conch., p. 



28, pi. 15, f. 4 (1827) KUSTER, Conchyl. Cab., p. 13, pi. 6, f. 4-7; 



pi. 9, f. 1, 2; pi. 10, f. 1-3. 



Bulimus perversus L., MOUSSON, Land- und Susswasser-Mollusken 



