146 OXYSTTLA, SOUTH AMERICAN. 



stantly black-brown, and this dark shade colors the right margin of 

 the lip and the whole columella. Alt. .55, diam. 24 mill. 



Around the Missions of San Xavier and Concepcion, Prov. Chiqui- 

 tos, Bolivia (Orb.). 



Helix phJogera ORB., Mag. de Zool. 1835, p. 8. Bulimus phlogerus 

 ORB., Voy. dans 1'AmeV. Merid. p. 257, pi. 29, f. 6, 7. PFR., Monogr. 

 ii, p. 145 (part). Orthalicus phlogerus BECK, Index, p. 59. Acha- 

 tina phlogera PFR., Symbolae ii, p. 134. 



Orbigny's description, from which the above is taken, does not 

 tally very well with his figures of this species. It is evidently allied 

 to 0. bensoni Rve., a larger and granulose species, occurring in a 

 moister and more tropical region. The smaller size of 0. phlogera, 

 the less developed color-pattern on the last whorl as compared with 

 0. bensonij and the broad variceal streaks, are all attributable to the 

 sparsely w 7 ooded and dry character of the region it inhabits. 



O. PFEIFFERI (Hidalgo). PI. 55, figs. 48, 49, 50. 



Shell oblong-conic, rather solid, smooth, little shining ; whitish- 

 violaceous, very closely painted with longitudinal somewhat waved 

 brown lines, and wide straight (variceal) streaks at irregular dis- 

 tances, each composed of a white and a brown streak ; covered with 

 an olivaceous cuticle. Spire long-conic, the apex tawny, rather ob- 

 tuse ; suture simple or lightly plicate. Whorls 7-8, nearly flat, 

 widening at a moderate rate, the last not descending in front, slightly 

 angular at its origin, somewhat tapering below. 



Aperture oblong-semioval, three sevenths the length of the shell, 

 dull white or brown inside; peristome simple, acute, broadly black- 

 bordered inside, the margins joined by a blackish entering callus; 

 columella a little twisted, rather straight, black, covered inside with 

 a thick whitish callus. (Hid.) 



Alt. 52, diam. 23 mill. 



Canelos, Ecuador (Martinez). 



Orthalicus pfeifferi HID., Journ. de Conchyl., 1869, p. 41; Catal. 

 Coq. Am. Merid., p. 39 (in Journ. de Conchyl., 1870), pi. 6, f. 8 ; 

 Viaje al Pacifico, Moluscos, p. 135, pi. 8, f. 3, 4. PFR., Monogr. viii, 

 p. 261 Zebra pfeifferi MILLER, Mai. Blatt. 1878, xxv, p. 186. 



The longer spire, flatter whorls, structure of the columella and sys- 

 tem of coloration, are the characters separating this species from 0. 

 phJogera Orb. 



