92 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



diameter i.o mm. Another specimen from the same source is in the 

 collection of the A.N.S.P. 



The minute size will readily distinguish this species from the other 

 ovate, nonumbilicate, much larger Odostomia nicoli (below). 



I take pleasure in naming this species for Dr. Frank Burns, who 

 assisted Dr. Dall for many years as an able field collector and pre- 

 parator. 



ODOSTOMIA (ODOSTOMIA) NICOLI, new species 



Plate 18, figure 3 



Shell ovate, cream-yellow. The nucleus is deeply obliquely im- 

 mersed in the first postnuclear whorl, above which the rather thick 

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

 strongly rounded on the first two turns and less so on the rest. They 

 are polished and separated by a moderately constricted suture. The 

 periphery is strongly rounded. The base is hemispherical, somewhat 

 inflated, strongly rounded, nonumbilicate, and polished. The aperture 

 is ovate, short, and oblique; the columella is short, reflected, and 

 rendered somewhat twisted by the strong fold a little below its inser- 

 tion ; the parietal wall is glazed by a thick callus ; the outer lip is thick 

 within and thin at the edge. 



The t)^e, U.S.N.M. No. 561736, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6.1 whorls and measures: Length 2.5 mm., 

 diameter i.i mm. Another specimen from the same source is in the 

 collection of the A.N.S.P. 



The much larger size will readily differentiate this species from 

 Odostomia burnsi (p. 91). 



I take pleasure in naming this species for Dr. David Nicol, asso- 

 ciate curator of invertebrate paleontology at the United States Na- 

 tional Museum. 



ODOSTOMIA (ODOSTOMIA) BASSLERI, new species 



Plate 18, figure 2 



Shell elongate-ovate, rather large, cream-yellow. The nuclear 

 whorls are deeply obliquely immersed in the first postnuclear turn, 

 above which only the rounded, tilted edge of the last whorl projects. 

 The postnuclear whorls are moderately rounded and polished. The 

 suture is moderately constricted. The periphery is well rounded. The 

 base is rather long, strongly rounded, and polished. The aperture is 

 almost semicircular, the curve of the parietal wall and columella 

 forming the axis; the columella is short, and rendered somewhat 



