'J^ SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



CHRYSALLIDA PILSBRYI, new species 

 Plate 16, figure 6 



Shell large, elongate-conic, cream-yellow. The nuclear whorls are 

 decollated in both of our specimens. The postnuclear whorls are 

 slightly rounded and slopingly shouldered from the second spiral 

 cord to the summit. They are marked by strong, slightly retractively 

 slanting axial ribs, of which 16 are present upon the second and 

 third, 18 upon the fourth, 20 upon the fifth, and 24 upon the last 

 whorl. The intercostal spaces equal the axial ribs in width. The spiral 

 sculpture consists of four cords that equal the axial ribs in strength. 

 These cords are separated by spaces as wide as the cords. The junc- 

 tion of the axial ribs and spiral cords forms strong, round tubercles, 

 while the spaces enclosed between them are round pits. The suture 

 is channeled and shows the edge of the peripheral cord. The periphery 

 bears a spiral cord which is feebly nodulose and about half as wide 

 as the cords above it. The base is hemispherical and marked by five 

 spiral cords that grow consecutively less strong from the periphery 

 basalward. The aperture is oval, somewhat effuse at the junction of 

 the basal lip and columella; the columella is oblique and provided 

 with a strong fold at its insertion; the parietal wall is glazed by a 

 strong callus ; the outer lip is rendered wavy by the external spiral 

 cords. 



The type, U.S.N.M. No. 561719, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 7 whorls remaining and measures : Length 

 4.0 mm., diameter 1.5 mm. Another specimen from the same source 

 is in the collection of the A.N.S.P. 



The more slender outline and detailed sculpture will readily dis- 

 tinguish this species from Chrysallida smithi (p. 75). 



I take pleasure in naming this species for Dr. H. A. Pilsbry, one of 

 the foremost malacologists in the world. 



CHRYSALLIDA MCGINTYI, new species 

 Plate 16, figure 7 



Shell moderately large, elongate-ovate, cream-yellow. The nuclear 

 whorls are decollated in all our specimens. The postnuclear whorls are 

 almost flattened, which gives to the lateral outline of the spire a 

 straight-line appearance. The postnuclear whorls are marked by 

 strong, retractively slanting axial ribs, which extend undiminished 

 from the summit to the periphery of the whorls. Of these ribs, 14 

 are present upon the second, 16 upon the third, 17 upon the fourth, 



