88 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, I25 



spherical, openly umbilicated, and without sculpture. The aperture is 

 broadly ovate ; the columella is slightly twisted, reflected, and provided 

 with a strong fold a little below its insertion; the parietal wall is 

 covered by a thick callus ; the outer lip is gently curved. 



The type, U.S.N.M. No. 561725, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6.4 postnuclear whorls and measures: 

 Length 4.2 mm., diameter 2.2 mm. U.S.N.M. No. 561726 contains 

 six additional specimens from the same source, and five more are in 

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



The much larger size and stouter form will readily distinguish this 

 from Odosfomia conradi (below). 



I take pleasure in naming this species for the late Dr. Charles 

 Willison Johnson, director of the Boston Society of Natural History. 



ODOSTOMIA (ODOSTOMIA) CONRADI, new species 

 Plate 17, figure 9 



Shell small, elongate-ovate, cream-yellow. The nucleus is deeply 

 immersed in the first postnuclear whorl above which the obliquely 

 tilted edge only projects. The postnuclear whorls are well rounded, 

 polished, and without sculpture. The suture is a mere impressed line. 

 The periphery is well rounded. The base is rather long, well rounded, 

 very narrowly umbilicated, and without sculpture. The aperture is 

 ovate ; the columella is stout and rendered twisted by the heavy fold 

 which it bears a little below its insertion; the parietal wall is glazed 

 by a thin callus ; the outer lip is rather thick, while the basal lip at its 

 junction with the columella renders the aperture effuse at this point. 



The type, U.S.N.M. No. 561727, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6 postnuclear whorls and measures: 

 Length 3.2 mm., diameter i.o mm. U.S.N.M. No. 561728 contains 

 five additional specimens from the same source, and five more are 

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



The more slender outline and less open umbilicus will readily dis- 

 tinguish this species from Odostomia johnsoni (p. 87). 



This species is named for Timothy A. Conrad, one of the pioneer 

 workers on the Southern Tertiaries. 



ODOSTOMIA (ODOSTOMIA) GABBI, new species 



Plate 17, figure 10 



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

 is deeply obliquely immersed in the first postnuclear whorl above 

 which the tilted edge of the last whorl only projects. The postnuclear 



