TWO NEW LAND SHELLS OF THE GENUS BULIMULUS 



FEOM BOLIVIA 



By William B. Marshall 



Assistant Curator, Division of Mollnsks, United States National Museum 



Six specimens of land shells from Tamafuini, on the Upper 

 Ayapayo River, 85 miles northeast of Oruro, Bolivia, collected in 

 1930 and presented to the National Museum by Frank L. Hess, of 

 the United States Geological Siirvej'^, included the two new species 

 which are described in this paper. 



BULIMULUS (SCUTALUS) HESSI, new species 



Plate 1, Figures 1, 2, 5, 6 



Shell large, stout, rather thick. Spire conoidal, whorls 7, slightly 

 convex, rapidly increasing. Apical whorls finely reticulated with 

 innumerable fine lines. Suture well marked, the summit of each 

 whorl margined by white, strong crenulations. Sculpture of many 

 coarse, slightly retractive growth riblets, the early whorls showing 

 many fine spiral incised lines; on the later whorls the spirals are 

 nearly obsolete, showing only here and there in the spaces between 

 the growth riblets. Body whorl very large. Apex white, next two 

 whorls flesh color, third whorl pale chestnut, next whorl chestnut, 

 body whorl nearly chocolate color, with a faint narrow darker spiral 

 line circling the peripher}^ Many of the growth riblets whitish. 

 Umbilicus large, but in a front view of the shell concealed by the 

 wide reflection of the columella. Aperture subquadrate, a trifle 

 elongate, its outer lip somewhat thickened and slightly reflected, basal 

 lip more reflected, the columella nearly perpendicular and widely 

 reflected over the open umbilicus. Parietal wall with a thick callus. 

 Edge of peritreme and the parietal callus cream color, a broad band 

 of white just within. Interior livid violaceous. 



Type.— The type (U.S.N.M. No. 382217) measures: Length, 56 

 mm ; greatest diameter, 28 mm ; height of aperture, 27 mm. It and 

 four paratypes (U.S.N.M. No. 382218) were received from F. L. Hess, 

 for whom the species is named. 



No. 2937.— Proceedings U. S. National Museum. Vol. 81, Art. 14. 



119297—32 I 



