NO. 2 PYRAMIDELLID MOLLUSKS BARTSCH 93 



twisted by the internal fold a little below its insertion ; the parietal 

 wall is glazed by a heavy callus ; the outer lip is decidedly arched. 



The type, U.S.N.M, No. 561737, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6.2 postnuclear whorls and measures: 

 Length 4.0 mm., diameter 1.8 mm. U.S.N.M. No. 561738 contains 

 three additional specimens from the same source and four more are in 

 the collection of the A.N.S.P. The large size will readily distinguish 

 this species from Odostomia cooperi (below). 



I take pleasure in naming this species for Dr. Ray S. Bassler, who 

 served the United States National Museum so many years as able 

 head curator of geology and foremost paleontologist. 



ODOSTOMIA (ODOSTOMIA) COOPERI, new species 

 Plate 18, figure 4 



Shell small, elongate-ovate, cream-yellow. The nuclear whorls are 

 deeply obliquely immersed in the first postnuclear turn, above which 

 the edge of the last whorl only projects. The postnuclear whorls are 

 moderately rounded, smooth, and polished. The suture is merely 

 indicated. The periphery is well rounded. The base is almost hemi- 

 spherical, polished, smooth. The aperture is elongate-oval, somewhat 

 effuse at the junction of the outer lip and columella; the columella is 

 twisted and provided with a strong fold a little below its insertion; 

 the parietal wall is glazed with a strong callus ; the outer lip is gently 

 curved. 



The type, U.S.N.M. No. 561739, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6.1 postnuclear whorls and measures: 

 Length 3.0 mm., diameter 1.5 mm. U.S.N.M. No. 361740 contains 

 another specimen from the same source and another is in the collec- 

 tion of the A.N.S.P. 



The smaller size and different aperture will easily distinguish this 

 species from Odostomia bassleri (p. 92). 



I take pleasure in naming this species for Dr. G. Arthur Cooper, 

 the helpful curator of invertebrate paleontology and paleobotany at the 

 United States National Museum. 



ODOSTOMIA (ODOSTOMIA) STEARNSI, new species 



Plate 18, figure 8 



Shell elongate-conic, chestnut-brown. The nucleus is deeply ob- 

 liquely immersed in the first postnuclear whorl, above which the 

 rounded, tilted edge of the last volution only projects. The post- 



