86 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



The lack of a deeply chaneled suture will readily distinguish this 

 species from Odostornia (Evalca) pomeroyi (p. 84). 



ODOSTOMIA (EVALEA) WILLCOXI, new species 

 Plate 17, figure 3 



Shell very elongate-ovate, not umbilicated, huffish in color. The 

 nuclear whorls, which are rather thick, are deeply immersed in the 

 first postnuclear turn. The postnuclear whorls are high and almost 

 flattened. They are separated by a weakly impressed suture. The 

 periphery of the last whorl is well rounded. The base is rather long 

 and well rounded with a mere umbilical chink. The entire surface 

 of spire and base is marked by closely spaced very fine incised spiral 

 lines. The aperture is elongate-ovate; the columella is moderately 

 stout and recurved and bears a strong spiral fold a little below its 

 insertion; the parietal wall is glazed by a weak callus; the outer lip 

 is gently curved and thin. 



The type, U.S.N.M. No. 561675, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 5 postnuclear whorls and measures: 

 Length 2.5 mm., diameter i.i mm. 



The absence of umbilicus will readily distinguish this species from 

 the other Evaleas here described. 



I have bestowed the name of Joseph Willcox, a former secretary 

 of the Wagner Free Institute of Science, who has done much work 

 in the Florida Tertiary, upon this species. 



Subgenus Odostomia Fleming 



Shell without axial or spiral sculpture except for microscopic lines 

 of growth. 



Type: Titrbo plicatiis Montagu. 



KEY TO THE SPECIES OF THE SUBGENUS ODOSTOMIA 



Shell umbilicated. 



Shell small, pupoid heilprini 



Shell not small or pupoid. 

 Shell elongate-ovate. 



Periphery of the last whorl rounded. 



Shell large johnsoni 



Shell not large conradi 



Periphery of the last whorl angulated. 



Shell stout gabhi 



Shell not stout stephensoni 



Shell elongate-conic. 



Shell stout schwengelae 



Shell not stout gunteri 



