OXYSTYLA, SOUTH AMERICAN. 143 



attained by the species. It is distinguished from most of the closely 

 allied forms of the 0. ferussaci type by wanting a chestnut parietal 

 callus. 



O. BIFULGURATA (Reeve). PI. 31, figs. 59, 60, 61. 



Shell imperforate, ovate-conic, striate and minutely decussated 

 with spiral lines; greenish-brown, elegantly decorated with pairs of 

 yellow zigzag lines. Spire convex-conic, obtuse ; whorls 5^, a little 

 convex, the last somewhat longer, inflated, somewhat tapering at 

 base. Aperture a little oblique, oval-oblong; peristome simple, un- 

 expanded ; the columella rather straight, compressed, white, its mar- 

 gin a little reflexed and adnate. 



Alt. 57, diam. 36, longest axis of aperture 33 mill. 



Alt. 50, diam. 24, longest axis of aperture 28 mill. 



Andes of Colombia (Reeve); Pilaton Valley, Ecuador, 1000 meters 

 alt. (Wolf). 



Bulimus bifulguratus REEVE, Conch. Icon., pi. 82, f. 606 (Dec., 

 1849). PFR., Monogr. Hi, p. 388. HIGGINS, P. Z. S., 1872, p. 687. 

 Orthalicus bifulguratus SIIUTTLETFORTH, Notitioe Malacologies i, 

 p. 60. Zebra bifulgurata COUSIN, Bull. Soc. Zool. France xii, p. 

 198. Zebra fidgur MILLER, Malak. Blatter xxv, p. 186 (1878), and 

 (n. F.) i, p. 201 (as Orthalicus julgur), pi. 6, f. 1 a, b. Of. DOHRN, 

 Jahrb. D. M. Ges. vii, p. 88. 



The ventricose form and elegant coloration are characteristic. Fig. 

 61 is the synonymous Z.fulgur of Miller. 



0. MARS (Pfeiffer). PI. 53, fig. 42. 



Shell imperforate, oblong-conic, solid, nearly smooth ; flesh-colored, 

 livid-clouded ; spire conic, the apex obtuse ; suture crenulated. Whorls 

 7, moderately convex, the middle marbled with grayish-white, the 

 last whorl about two-fifths the length of the shell, wrinkle-striated 

 anteriorly. Aperture oblique, oval, pearly white in the interior; 

 peristome unexpanded, obtuse, black-bordered inside, the termina- 

 tions connected by an entering black callus ; columella black, callous, 

 twisted and folded. Alt. 77, diam. 35, aperture 36 mill, long, 21 

 wide (P/r.). 



Ecuador (Cuming Coll.). 



Orthalicus mars PFR., P. Z. S., 1861, p. 25, pi. 2, f. 8 ; Malak. 

 Blatter 1861, p. 77 ; Monogr. vi, p. 202. Corona mars COUSIN, 



