OXYSTYLA, SOUTH AMERICAN. 141 



Var. SUBPULCHELLA n. v. PI. 28, figs. 38, 39. 



Small and rather thin, smooth, showing under the lens fine, dense, 

 irregular, wavy or anteriorly-descending spiral striation with occa- 

 sional slight malleation, exactly as in 0. princeps and its allies. 

 White, with rather close, fine markings of longitudinal undulating 

 stripes, and three interrupted or subcontinuous spiral bands, the 

 stripes generally split above the upper band, as in many specimens 

 of O.pulchella var. prototypus; varices narrow, black and conspicuous, 

 generally 2 or 3 on the last whorl, and one or more on the next earlier; 

 apex black. Aperture conspicuously striped inside ; peristome edged 

 with blackish ; parietal callus dark chestnut, rather thin ; columella 

 rather straight, and white. Whorls 5-J. 



Alt. 34, diam. 20, longest axis of aperture 20^ mill. 



Union Island, Grenadines (C. D. Stewart). 



Paler and more finely marked than the Trinidad 0. undata, and 

 differing conspicuously from all forms of that species in the fine 

 sculpture. It lacks the yellow or brown cuticle of 0. pulchella and 

 its variety prototypus. It seems to lie on the debatable borderland 

 between undata, maracaibensis and pulchella. 



O. FULVESCENS (Pfeiffer). PI. 29, figs. 47, 48. 



Pfeiffer's type, as described by Strebel, is a thin though strong 

 shell, with dirty Isabella tinted ground-color, becoming lighter toward 

 the apex, darker below, the embryonal whorls with no brown dot ; 

 sometimes spiral bands appear, but usually only narrow brown-black 

 varix-streaks, light bordered in front. Whorls 6J. The peristome 

 is narrowly dark-edged outside, the dark more broadly spreading 

 inside ; the parietal callus is chestnut-brown, and the interior of the 

 aperture brownish-purple-white. The sculpture consists of incon- 

 spicuous longitudinal wrinkles, a slightly-developed plication at the 

 suture, and fine, distinct spiral grooves. The white columella is sin- 

 uous and stands oblique to the axis of the shell. The last whorl is 

 distinctly keeled at the periphery. 



Alt. 51.1, diam. 29.9, aperture 25.3 mill. (type). 



Alt. 42.3, diam. 24.8, aperture 22.2 mill. (Rio Hacha specimen). 



Rio Hacha, Colombia (Strebel). 



Bulimus zebra y PFR., Monogr. Helic. Viv. ii, p. 144 B. zebra 



var., PFR., Conchyl. Cab. p. 377, pi. 22, f. 11 Orthalicus fidves- 



cens PFR., Malak. Blatter iii, p. 187 (1856); Monogr. iv, p. 590 



