NO, 2 PYRAMIDELLID MOLLUSKS — BARTSCH 29 



aperture is subquadrate ; the columella is short, moderately stout, re- 

 flected, and provided with a weak oblique fold at its insertion; the 

 parietal wall is glazed by a thin callus; the outer lip bears several 

 spiral cords deep within. 



The type, U.S.N.M. No. 561681, comes from the Pliocene of North 

 St, Petersburg, Fla, It is a young specimen, having 8 postnuclear 

 whorls, and measures: Length 5.0 mm., diameter 1,8 mm. 



The acutely tapering outline and spiral sculpture will readily 

 distinguish this species from the rest of the known Mormulas. 



I take pleasure in naming this species for Dr, Julia Gardner, one of 

 America's foremost feminine paleontologists. 



MORMULA MANSFIELDI, new species 

 Plate 4, figures 9a, b 



Shell elongate-turrited, cream-yellow. The nuclear whorls are 

 lost in both of the specimens seen. The postnuclear whorls are flat- 

 tened and slightly shouldered at the summit. They are marked by 

 very strong axial ribs, of which 16 are present upon all but the last 

 turn, which has 18, These ribs are strongest at the summit and pass 

 only feebly beyond the periphery on the base. The intercostal spaces 

 are a little wider than the ribs and are marked by six rather wide, 

 strongly incised spiral grooves, of which the one near the summit is 

 less strong while the rest are subequal. The spacing of these incised 

 grooves is best visualized by viewing our detailed sketch (pi, 4, fig. 

 9b), The suture is rendered wavy by the summit of the axial ribs. 

 The periphery is well rounded. The base is hemispherical and marked 

 by six incised spiral lines which vary in strength and spacing. The 

 aperture is obliquely subquadrate; the columella is short, slender, 

 curved, and slightly revolute, and bears a weak fold at its insertion; 

 the outer lip bears four spiral folds within that vary in strength. 



The type, U.S.N.M. No. 561682, comes from the Pliocene of North 

 St, Petersburg, Fla, It has 8.9 whorls remaining, which measure: 

 Length 6.2 mm., diameter 2.0 mm. Another specimen from the same 

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



The less tapering outline and stronger sculpture will easily dis- 

 tinguish this species from Mormula gardnerae (p, 28), 



I take pleasure in naming this species for the late Dr. W. C. Mans- 

 field, of the United States Geological Survey, who has done much 

 work in Florida Tertiary paleontology. 



