NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 7I 



are obsolete on the first whorl, while the second bears i6, the third 

 18, the fourth 20, and the last 25. These ribs are much wider than 

 the spaces that separate them. The spiral sculpture consists of five 

 cords which equal the axial ribs in width and render these nodulose 

 at their junction, the nodules being low and rounded and subequal 

 on the upper four cords and less strongly developed on the fifth cord 

 which is also a little narrower than the rest. The suture is strongly 

 impressed and rendered wavy by the tubercles at the summit of the 

 whorls. The base is hemispherical and marked by five spiral cords 

 which grow consecutively smaller from the periphery basally. The 

 base also bears many fine axial threads. The aperture is oval and 

 effuse at the junction of the basal lip and columella; the columella is 

 slender and reflected and bears a strong fold at its insertion; the 

 parietal wall is glazed by a callus ; the outer lip is thin and is rendered 

 wavy by the external spiral cords. 



The type, U.S.N.M. No. 561711, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6.2 whorls remaining and measures: 

 Length 3.2 mm., diameter i.i mm. 



This species is nearest related to Chrysallida woodringi (p. 70), 

 from which its much more slender form will readily distinguish it. 



I take pleasure in naming this species for Dr. T. Wayland Vaughan, 

 whose many years of work in Tertiary paleontology, corals, and 

 oceanographic research have been of great help to many of us. 



CHRYSALLIDA STIMPSONI, new species 



Plate 16, figure 11 



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

 whorls are decollated. The postnuclear whorls are very slightly 

 rounded and strongly, squarely shouldered. The sculpture of the 

 first postnuclear whorl is obsolete. The succeeding whorls are marked 

 by strong axial ribs, of which 12 are present upon the second, 14 

 upon the third, 18 upon the fourth, and 20 upon the last whorl. The 

 intercostal spaces equal the axial ribs in width. The spiral sculpture 

 consists of four strong cords, of which the upper three are of equal 

 strength, while the fourth is a little weaker. The first cord is at the 

 summit and is separated from the second by a mere impressed line. 

 The space separating the second from the third cord is about as wide 

 as that separating the third from the fourth cord and equal to the 

 width of the cords. The junction of the axial ribs and spiral cords 

 forms strongly elevated tubercles which are equal on the upper three 

 spiral cords but only merely indicated on the fourth cord. The spaces 



