NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 95 



ODOSTOMIA (ODOSTOMIA) PINELLASENSIS, new species 

 Plate 1 8, figure i 



Shell elongate-conic, slender, cream-yellow. The nucleus is deeply 

 obliquely immersed in the first postnuclear whorl, above which only 

 the rounded, tilted edge projects. The postnuclear whorls are almost 

 flattened, polished, shining, showing traces of exceedingly fine 

 closely spaced striations under high magnification. The suture is a 

 mere transverse line. The periphery of the last whorl is well rounded. 

 The base is moderately long, strongly rounded, and marked like the 

 spire. The aperture is ovate; the columella is short, oblique, slightly 

 twisted and slightly reflected, and bears a strong fold a little below its 

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

 is gently curved and thin at the edge. 



The type, U.S.N.M. No. 561744, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6.5 postnuclear whorls and measures : 

 Length 3.5 mm., diameter 1.2 mm. Another specimen is in the col- 

 lection of the A.N.S.P. 



The much more slender form will readily distinguish this species 

 from Odostomia coxi (p. 94). 



