90 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



ODOSTOMIA (ODOSTOMIA) SCHWENGELAE, new species 

 Plate 17, figure 8 



Shell large, elongate-conic, cream-yellow. The nucleus consists of 

 about 2 whorls, which are deeply immersed in the first postnuclear 

 whorl above which the tilted edge only projects. The postnuclear 

 whorls are almost flattened, rather high, and without sculpture. The 

 suture is a mere line. The periphery is strongly rounded. The base 

 is rather long, strongly rounded, and narrowly umbilicated, and with- 

 out sculpture. The aperture is elongate-ovate; the columella is 

 slender, rendered somewhat twisted by the strong fold, which is a 

 little anterior to its insertion ; the parietal wall is glazed by a strong 

 callus ; the outer lip is thin and gently curved. 



The type, U.S.N.M. No. 561732, comes from the Pliocene of 

 North St. Petersburg, Fla. It has 7.0 postnuclear whorls and meas- 

 ures: Length 4.8 mm., diameter 1.9 mm. Another specimen from the 

 same source is in the collection of the A.N.S.P. 



The larger size and more robust form will readily distinguish the 

 species from Odostomia gunteri (below). 



I take pleasure in naming this species for Dr. Jeanne S. Schwengel, 

 who has done much in promoting the efforts of the American 

 Malacological Union as well as adding materially to our knowledge of 

 Florida mollusks by her dredging and publications. 



ODOSTOMIA (ODOSTOMIA) GUNTERI, new species 

 Plate 17, figure 11 



Shell moderately large, elongate-conic, cream-yellow. Nuclear 

 whorls small, probably two, deeply obliquely immersed in the first 

 postnuclear whorl, above which the tilted edge of the last whorl only 

 projects. The postnuclear whorls are almost flattened, polished, 

 smooth. The suture is a mere impressed line. Periphery well rounded. 

 The base is rather long, narrowly umbilicated, polished like the spire. 

 The aperture is rather long, ovate; the columella is thin, somewhat 

 twisted, slightly revolute and provided with a moderately strong fold 

 a little below its insertion ; the parietal wall is glazed with a very thin 

 callus ; the outer lip is gently curved and thin at the edge. 



The type, U.S.N.M. No. 561733, comes from the Pliocene of 

 North St. Petersburg, Fla. It has 6.9 postnuclear whorls and meas- 

 ures: Length 4.1 mm., diameter 1.5 mm. Another specimen is in the 

 collection of the A.N.S.P. 



The more slender form will easily distinguish the species from 

 Odostomia schwengelae (above). 



