ART. 19 WEST AFRICAN SNAILS — PLLSBRY 6 



Descinption. — The shell is moderately solid, oblong-conic, with 

 conspicuously mammillate summit. Last whorl honey-yellow with 

 some chestnut suffusion and numerous oblique chestnut lines of vary- 

 ing intensity, also a few scattered dots. Penultimate whorl with 

 broad, ill-defined, whitish and chestnut-brown stripes and some 

 opaque white spots in the upper half; earlier whorls whitish. Sur- 

 face shining, smoothish, with fine wrinkles of growth and a faint, 

 shallow, and close microscopic spiral striation, only perceptible in 

 some places. There are two conspicuous growth rests on the last 

 whorl. The whorls are rather weakly convex, the last rounded 

 peripherally, though the shell is apparently angular when young, 

 as a blunt angulation of the penultimate whorl is exposed above 

 the suture. Suture margined, the margin regularly crenulated. 

 The aperture is moderately oblique, ovate, whitish with dark streaks 

 within. Columella white, vertical, nearly straight, curving into 

 the basal margin, not truncate. 



Length. 69.2 mm; diameter, 32.7 mm; aperture, 31.5 mm long; 8 

 whorls. 



Remarks. — This species has much in common with P. torridus 

 (Gould), but the narrower contour and the difference in color 

 pattern serve to differentiate them in the series now available. 



PSEUDOTROCHUS COFFEAMONTIS. new gpecies 

 Plate 1, Figube 5 



ry/?^.— U.S.N.M. No. 151004, collected by Rolla P. Currie at 

 Mount Coffee, Liberia, 1897. 



Description, — The shell is thin, ovate, with mammillate summit, 

 honey-yellow to old gold in color, with some narrow, inconspicuous, 

 whitish streaks on the spire, the upper whorls of which are pale 

 isabella color. Surface mat with slightly glossy patches where 

 worn, the apex glossy. Under the lens fine engraved spiral lines 

 are seen on postembryonic whorls of the spire and the upper part of 

 the last whorl. The microscope shows a clothlike texture of criss- 

 cross scratches, especially well developed in the middle and basal 

 parts of the last whorl and more or less obsolete in the upper part. 

 The whorls are feebly convex, the last rounded peripherally. Su- 

 ture superficial, a slight concavity below it, where the otherwise 

 weak growth wrinkles are strengthened into short, recurved little 

 folds. Aperture ovate, fleshy whitish inside. Columella very little 

 thickened, slightly concave, obliquely subtruncate below. Parietal 

 callus very thin, transparent. 



Length, 55.9 mm; diameter, 30.5 mm; aperture, 30 mm long; 7^4 

 whorls. 



