NO. 2 PYRAMIDELLID MOLLUSKS — ^BARTSCH 9I 



I take pleasure in naming this species for Herman Gunter, director 

 of the Florida State Geological Survey. 



ODOSTOMIA (ODOSTOMIA) MATSONI, new species 

 Plate 18, figure 6 



Shell very small, of pupoid shape, brown. The nucleus is deeply 

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

 rounded, tilted edge of the last volution projects. The postnuclear 

 whorls are rather high, well rounded, and polished. The suture is a 

 mere impressed line. The periphery is well rounded. The base is 

 hemispherical, smooth, and not umbilicated. The aperture is ovate; 

 the columella is rather stout, slightly reflected, and rendered some- 

 what twisted by the strong fold a httle below its insertion; the 

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

 and thin at the edge. 



The type, U.S.N.M. No. 561734, comes from the Pliocene of North 

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

 Length 2.0 mm., diameter 0.9 mm. 



The minute size, pupoid shape, strong adult features, and coloration 

 will readily distinguish this from all other nonumbilicated species. 



I take pleasure in naming this species for George C. Matson, of 

 the U.S. Geological Survey, who has done much work upon the 

 Florida geology. 



ODOSTOMIA (ODOSTOMIA) BURNSI, new species 

 Plate 18, figure 5 



Shell small, ovoid, cream-yellow. The nucleus is deeply obliquely 

 immersed in the first postnuclear whorl, above which a little of the 

 rounded edge of the last volution only projects. The postnuclear 

 whorls increase in width from summit to periphery and from 

 whorl to whorl and in rounding in such a manner as to produce the 

 egg-shaped appearance. In this they are aided by the lightly im- 

 pressed suture. The entire spire is polished. The periphery is 

 rounded. The base is hemispherical, strongly rounded, nonumbilicate 

 and polished. The aperture is small and oval ; the columella is short, 

 thick, and reflected, and provided with a strong fold a little below its 

 insertion; the parietal wall is covered by a thick callus that almost 

 renders the peristome complete ; the outer lip is thick within, thin 

 at the edge. 



The type, U.S.N.M. No. 561735, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 5.2 whorls and measures : Length 2.2 mm., 



