144 OXYSTYLA, SOUTH AMERICAN. 



Bull. Soc. Zool. France xii, 1887, p. 1D3. MII.I.EK, Malak. Bl. xxv, 

 p. 185, 1878. 



Known only by the description and figure given by Pfeiffer. The 

 folded columella apparently separates this species from 0. ponderosa 

 and 0. decolor, which are extremely similar in form and coloration. 

 See pp. 130, 131. 



O. VAKIA (von Martens). PI. 32, figs. 69-77. 



Shell oblong-conic, rather thin but solid, the surface slightly glossy, 

 with slight, line growth-wrinkles but no spiral strife or only faint stri- 

 ation in places; ground-color whitish, light yellow, light olivaceous- 

 brown or pink, generally marked with several narrow interrupted 

 blackish-brown or purple-brown girdles, and numerous narrow longi- 

 tudinal stripes above the upper girdle, and often irregular streaks or 

 blotches over the rest of the last whorl ; usually several blackish 

 varices on the last whorl, sometimes wanting or pale. Spire long, 

 the apex obtuse, whitish. Whorls (1 : t ! -7, convex. 



Aperture small, less limit half us Imnj as the shell, somewhat oblique, 

 whitish, variously marked within ; peristome thin and acute, narrowly 

 dark-edged ; columella convex, twisted, its edge white, in old speci- 

 mens calloused; parietal wall dark chestnut or blackish, rarely 

 colorless. 



Alt. -I."), diam. '2 2 -.',-, length of aperture 23 mill. 



Alt. 42],, diam. 23, length of aperture 22 mill. 



Alt. 43, diam. 21 .',, length of aperture 21^ mill. 



Ven<'jn'lu: Aiiyostitra (Gruner, Bluine); Caracas (Ernst, Suite); 

 liritish Guiana: Demrruru (Cuming coll.) 



Jiitliintis j>lilof/erus PKK., Monogr. ii, p. 14") (exclusive of syn- 

 onymy); C'onchyl. Cab.. ///////////*. p. HH 1 ,, pi. 17. I'. 7. ( ). < >,-tlil- 

 inis fihluijt-rns \ar. ; and ,, Sini i i.KWoKTH. Notitia- Malak. i. pp. 

 65, Nil, pi. \. f. 1, 2 SKMI-KK, Iveisen ini Arcliip. Phil., Landmoll., 

 p. 24S. pi. 1."), f. ~2 (geniialia ). ( )rth<ilicns rurins \. .M A KT I.NS. Hin- 

 Denmoll. Venez., p. "!, in l-YstM-hr. l-'eiep lll(l-j;ihrigeii l.estelieiis 

 Ges. Naturlorsch. Freunde /u lierlin, p. 1DO, pi. 1, f. -la, 4b (1.S73). 



I'l i;.. .Mdiiii.jr. viii, p. 2<i-l Achatiiui flm/i-rn P 1 1'IKX. tfc MlCIIAL'D, 



(.all ric i, p. ]'2~. pi. 12, f. 1, 2 (young .shells). 



Extremely variable in coloring, yet readily distinguished from all 

 other .-pi -eies of (lie -aim- re^imi l>v its rloiigatfd form and small aper- 

 ture. It is allied to (>. iltl'ii/cru and O. bensoni. The latter is 



