NO. 2 PYRAMIDELLID MOLLUSKS BARTSCH ^^ 



cord which bears tubercles that are a little less strong than those on 

 the spiral cords above it. The base is well rounded and marked by 

 four equal and equally spaced, low, slightly rounded spiral cords. 

 The aperture is oval ; the columella is oblique and somewhat reflected 

 basally and bears a strong fold at its insertion ; the parietal wall has 

 a weak callus ; the outer lip is gently curved and rendered wavy by the 

 external spiral cords. 



The type, U.S.N.M. No. 561704, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 5.5 postnuclear whorls and measures: 

 Length 2.3 mm., diameter i.o mm. An additional specimen is in the 

 collection of the A.N.S.P. 



I take pleasure in naming this species for Dr. K. V. W. Palmer, 

 Dr. Harris's able associate at the Paleontological Research Institute, 

 at Cornell University, of which she is now the director. 



CHRYSALLIDA MANSFIELDI, new species 



Plate IS, figure 14 



Shell elongate-ovate, cream-yellow. The nucleus consists of about 

 2 whorls, which form a helicoid spire whose axis is at right angles to 

 that of the postnuclear spire, in the first whorl of which the nucleus 

 is half immersed. The postnuclear whorls are almost flattened and 

 crossed by very strong axial ribs, which are of the same strength 

 from the summit to the periphery. Of these ribs 12 are present upon 

 the second, 14 upon the third, 16 upon the fourth, 18 upon the fifth, 

 and 20 upon the last whorl. The intercostal spaces are a little nar- 

 rower than the axial ribs. The spiral sculpture consists of four equal 

 and equally spaced cords, the first of which is at the summit of the 

 whorl. The junction of the axial ribs and spiral cords forms strong, 

 oval tubercles whose long axis corresponds with the spiral cords. The 

 spaces enclosed by the axial ribs and spiral cords are almost round, 

 deep pits. The suture is not deeply channeled. It is rendered wavy by 

 the strong tubercles at the summit of the whorl. The periphery bears 

 a spiral cord that is not quite so strong as the four above it and which 

 is weakly nodulose. The base is rather short, hemispherical, well 

 rounded. It bears seven spiral cords which become consecutively 

 smaller from the periphery basalward. These cords are low, and 

 are separated by narrow, subequal, impressed lines. The aperture is 

 ovate ; the columella is moderately stout, slightly curved, and slightly 

 effuse and reflected basally; it bears a strong fold at its insertion; 

 the parietal wall is covered by a thin callus; the outer lip is gently 

 curved, thin, and rendered wavy by the external cords. 



