NO. 2 PYRAMIDELLID MOLLUSKS BARTSCH 87 



Shell not umbilicated. 



Shell pupoid matsoni 



Shell not pupoid. 

 Shell ovate. 



Shell small burnsi 



Shell of medium size nicoli 



Shell not ovate. 



Shell elongate-ovate. 



Shell large bassleri 



Shell small cooperi 



Shell elongate-conic. 



Whorls almost flattened steamsi 



Whorls not almost flattened. 



Shell stout coxi 



Shell slender pinellasensis 



ODOSTOMIA (ODOSTOMIA) HEILPRINI, new species 

 Plate 17, figure 5 



Shell minute, pupoid, cream-yellow. The nucleus is deeply obliquely 

 immersed in the first postnuclear whorl, above which only the tilted 

 edge of the last turn projects. The postnuclear whorls are well 

 rounded, polished, and without sculpture. The suture is well marked. 

 The periphery is rounded. The base is hemispherical, very narrowly 

 umbilicated, and devoid of sculpture. The aperture is oval ; the colu- 

 mella is somewhat twisted with its edge slightly reflected; it bears 

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

 callus ; the outer lip is evenly curved, thin at the edge, but thick within. 



The type, U.S.N.M. No. 561724, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 5.2 postnuclear whorls and measures: 

 Length 2.4 mm., diameter 1.2 mm. 



The minute size and pupoid shape will easily distinguish this spe- 

 cies from the others here described. 



I take pleasure in naming this species for Prof. Angelo Heilprin, 

 who was the first to give the East American Pliocene a definite status. 



ODOSTOMIA (ODOSTOMIA) JOHNSONI, new species 



Plate 17, figure 6 



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

 is small and deeply obliquely immersed in the first postnuclear whorl, 

 showing only the tilted edge of the last whorl. The postnuclear whorls 

 are much broader at the periphery than at the summit; they are 

 slightly rounded and devoid of sculpture. The suture is lightly im- 

 pressed. The periphery is well rounded. The base is broad, hemi- 



