OXYSTYLA, SOUTH AMERICAN. 147 



There are sixty longitudinal lines on the last, 51 on the penulti- 

 mate whorl in the type specimen in the collection of Sr. Paz. In one 

 in the Madrid Museum there is a whitish zone in the middle of the 

 last whorl, interrupting most of the longitudinal stripes (fig. 50). 



O. MACANDREWI (Sowerby). PI. 41, fig. 5. 



Shell elongated ; grayish-fulvous, streaked and zoned with brown, 

 here and there radiated with black. Apex a little obtuse, grayish- 

 lilac. Whorls 8^, regularly increasing, a little convex, longitudinally 

 lightly striated, separated by impressed sutures, spirally marked with 

 three slightly conspicuous, brown and white articulated lines, vanish- 

 ing on the whorls after the penultimate one ; the last whorl about as 

 long as the spire, roundly conyex, with a grayish-fulvous zone above, 

 brown ones at the middle and beneath ; columella nearly straight, 

 rather thin, grayish-lilac within, black outside. Aperture semioval, 

 lilac within ; peristome simple, hardly reflexed, slightly thickened, 

 black-edged ; columellar margin covered with a wide black callus 

 spreading inward. Alt. 70, diam. 30 mill.; aperture 28 mill, long, 

 16 wide (Sowerby}. 



San Diego de Cou, Peru. 



Orthalicus MacAndrewi SOWB., Journ. Linn. Soc. London xx, 

 Zoology, p. 399, pi. 25, f. 18 (December 31, 1889). 



"This species, of which I have seen only a single specimen, is: 

 similar in form to 0. bensoni, but it has no spiral sculpture, and the 

 coloring consists principally of light brown zones with a few longitu- 

 dinal streaks of brown and black. The articulated painting is very 

 slight, and is only to be seen on the upper whorls." (Sowb.) 



0. BENSONI (Reeve). PI. 31, figs. 62, 63, 64, 65. 



Shell acuminate-oval, moderately solid, purplish or fleshy-white, 

 usually covered with a greenish-yellow cuticle, and varied with 

 numerous narrow longitudinal purple-brown stripes fading at their 

 edges, or fewer wide stripes, and encircled by three narrow girdles of 

 purple-brown oblong or arrow-shaped spots alternating with shorter 

 cream-white intervals, the basal girdle less distinct, the median and 

 upper ones ascending the spire ; one variceal streak or none. Surface 

 scarcely shining, with close and rather irregular wrinkles of growth, 

 decussated and rendered granose by fine, close, deeply- cut spiral striae. 

 Spire long, a little contracted near the obtuse apex ; whorls 7^ to 8, 



