1913.] natural sciences of philadelphia. 625 



List of Species with Descriptions of those which seem to be 



New. 



HELIOINID^. 



Genus HELICINA Lamarck. 

 Helicina lirifera Ancey. 



Helicina lirifera Ancey, Jour, of Conch., vii, p. 96, 1892. Wagner, Con- 

 chylien Cabinet, Helicinidce, p. 286. 



A single, half-grown specimen was taken at Camp 40, ]\I. ife M. 

 R. R., and about thirty specimens, mostly dead and of various ages, 

 were taken at Camp 39. 



In his original description Ancey says, "In front scarcely noticeably, 

 or not at all descending." The largest specimens taken descend 

 positively, though not greatly, in front for about half a turn, leaving 

 the sharp keel of the preceding whorl fully exposed. I suspect that 

 Ancey 's description was based on specimens not fully matured, and 

 it seems better to add this point to the description of his species, 

 rather than create a new subspecies, inasmuch as these shells agree 

 perfectly in all other respects with his description. The mature 

 specimens have 5 whorls; no specimen with over 4| whorls fails to 

 show the characteristic drop of the last whorl. 

 Helicina schereri n. sp. PI. XXI, figs. 1, 2. 



Shell thin, imperforate, turbinate, subglobose, with slightly convex 

 sides; color yellowish to reddish bronze; apex obtuse, slightly 

 mammillate, smooth for about one whorl, then everywhere sculp- 

 tured with nearly even and evenly spaced, narrow, spiral keels with 

 broader interspaces, about seven or eight keels showing on each 

 whorl, the keels weakening and becoming more crowded and less 

 distinct on the base, but extending to the umbilical region and 

 dipping deeply into the aperture in some apparently mature speci- 

 mens; keels everywhere crossed by sharply retractive, crowded 

 growth lines which are exaggerated into distinct costulse in places 

 on the lower whorls. Whorls 4j, somewhat convex, the last sub- 

 angulate at the beginning, but becoming well rounded toward the 

 mouth, scarcely descending in front; sutures very distinct. Aper- 

 ture broadly semilunar, oblique; peristome very evenly rounded, 

 somewhat thickened and slightly expanded, but not reflected, the 

 upper extremity joining the parietal wall at an angle slightly under 

 90 degrees, the lower extremity rounding broadly into the columella; 

 columella short, nearly vertical, broadened above; parietal . wall 

 slightly convex, with a callus varying in apparently mature specimens 

 from a small band seen only deep within the mouth to a broad, thin 



