4 PROCEEDINGS OF THE IST xiTIONAL MUSEUM VOL.77 



Evidently closely related to Odontostomius {Spixia) lemoinei Ancey ^ 

 from which it principally differs in having no tooth on the parietal 

 wall. 



PLANORBIS PAYSANDUENSIS, new species 

 Plate 1, Figures 1, 4, 6 



Upper surface flattened, the center sunken, all the whorls showing 

 in the central pit. Sutures deep, each whorl attached to the preced- 

 ing whorl just below its roundly angulate upper edge, thus forming 

 a spiral ridge into the pit. Under surface sloping inward, the 

 umbilicus showing all the whorls, which descend into it as a narrow 

 ridge. Sculpture of numerous transverse growth striae, with rest 

 periods indicated by a slight thickening; spiral sculpture of nearly 

 obsolete fine striae. Aperture nearly semielliptic, oblique slightly 

 angled at the base, lip sharp. Color, upper surface pale straw ; lower 

 surface nearly white. 



The type (Cat, No. 380693, U.S.N.M.) measures: Greater diame- 

 ter, 15 mm, ; smaller diameter, 12 m. ; height 5 mm. It and a para- 

 type (Cat. No. 380694, U.S.N.M.) came from Paysandu, Uruguay, 

 and were presented by Doctor Felippone, who says they are rare. 

 The paratype has the aperture uptilted, while the type has it hori- 

 zontal. The inward sloping base and the low altitude as compared 

 tvith diameter will serve to distinguish this species from all others 

 of the Uruguayan region. 



AMPULLARIA PALMERI, new species 



Plate 1, Figures 5, 8 



Shell large and thick, higher than wide. Whorls obscurely 

 shouldered and obsoletely angled below the shoulder. Body whorl 

 including about seven-eighths the height of the shell. Sutures well 

 impressed. Longitudinal sculpture of moderately strong growth 

 striae with several rest periods plainly marked, and emphasized by 

 dark chestnut transverse bars just behind them. Concentric sculp- 

 ture of nearly microscopic close-set, slightly waving, minutely granu- 

 lar striae, some of them, especially on the upper whorls, and at nearly 

 regular intervals, are stronger and under a lens stand out as lines of 

 spiral granules. On the body whorl these granules tend to coalesce 

 to form continuous spiral lines much stronger than the minute 

 spiral striae. Umbilicus not very wide, aperture somewhat elongate, 

 auriform, outer lip sharp, thickened within; columella nearly erect, 

 slightly reflected toward the umbilicus, a moderately thick callus 

 across the parietal wall. Color mixed tints of olive and chestnut, 



1 Jour. Conch., vol. 7, 1892, p. 93, fig. 1 ; p. 97. 



