74 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



St. Petersburg, Fla. It has 6.3 postnuclear whorls and measures: 

 Length 3.9 mm., diameter 1.6 mm. 



This species is easily distinguished from Chrysallida sayi (below) 

 by its stouter form. 



I take pleasure in naming this species for one of the partners, 

 Charles R. Locklin, whose joint effort has made these reports on the 

 North St. Petersburg Pliocene fauna possible. 



CHRYSALLIDA SAYI, new species 

 Plate 16, figure 13 



Shell elongate-conic, slender, cream-yellow. The nuclear whorls 

 are decollated. The postnuclear whorls are almost flattened and 

 shouldered at the top. They are marked by strong retractively slant- 

 ing axial ribs, which are of the same strength from the summit to the 

 periphery. Of these ribs 12 are present upon the second whorl, 14 

 upon the third, 16 upon the fourth, 18 upon the fifth, and 20 upon the 

 last. The intercostal spaces are as wide as the ribs. The spiral sculp- 

 ture consists of four strong cords which are as wide as the ribs and 

 render these strongly, roundly nodulose. The spaces between the 

 spiral cords are about half as wide as the cords, and the spaces en- 

 closed by the axial ribs and spiral cords are deep, rounded pits. The 

 suture is deeply channeled and shows the edge of the peripheral 

 spiral cord. It is rendered wavy by the strong tubercles at the summit 

 of the whorls. The periphery is marked by a spiral cord that is not 

 quite as wide as those above it. The space separating the peripheral 

 cord from the cord above it is as wide as the spaces separating the 

 spiral cords on the spire. The base is strongly rounded and marked 

 by seven spiral cords, of which the two below the periphery are 

 stronger than the rest, which become consecutively weaker and are 

 very faint toward the tip of the columella. The base also has numer- 

 ous very fine axial threads. The aperture is probably oval, the outer 

 lip being broken, does not complete it; the columella is straight and 

 bears a strong fold at its insertion; the parietal wall is glazed by a 

 thin callus. 



The type, U.S.N.M. No. 561716, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6.1 whorls remaining and measures: 

 Length 3.0 mm., diameter i.i mm. Another specimen is in the collec- 

 tion of the A.N.S.P. 



The slender outline will readily distinguish this from Chrysallida 

 locklini (p. 73). 



It is named for Thomas Say, one of America's able pioneer 

 naturalists. 



