64 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



wonderful fauna of the Caloosahatchie deposits focused attention 

 upon the rich Pliocene deposits of Florida. 



CHRYSALLIDA COOICEI, new species 

 Plate 15, figure 10 



Shell small, elongate-ovate, cream-yellow. The nuclear whorls are 

 decollated in the type. The postnuclear whorls are rounded and 

 slopingly shouldered from the second spiral cord to the summit. The 

 postnuclear whorls are marked by very strong, slightly retractively 

 slanting axial ribs, of which i6 are present upon all the whorls except 

 the first and the last, the latter having 17. The intercostal spaces are 

 about as wide as the ribs and are crossed by four spiral cords, of 

 which the first at the summit and the last are a little weaker than the 

 other two. The junction of the axial ribs and spiral cords forms 

 strong tubercles, while the spaces enclosed by them are deep and 

 slightly oblong, their long axis coinciding with the spiral sculpture. 

 The suture is deeply impressed and rendered wavy by the tubercles 

 of the cord at the summit of the whorls. The periphery is marked 

 by a deep groove a little wider than that separating the fourth from 

 the third cord. It is crossed by the continuation of the axial ribs 

 which terminate at the first basal cord. The base is well rounded and 

 marked by six spiral cords, of which the one below the peripheral 

 groove is the strongest; the rest grow consecutively weaker. The 

 spaces between these cords are crossed by many fine axial threads. 

 The aperture is ovate, slightly effuse at the junction of the columella 

 and basal lip ; the columella is slender, gently curved, and bears a 

 strong fold at its insertion; the parietal wall has a weak callus; the 

 outer lip is thin, gently curved, and rendered slightly wavy by the 

 spiral cords. 



The type, U.S.N.M. No. 561701, comes from the Pliocene of North 

 St. Petersburg, Fla. It has 6 postnuclear whorls and measures : 

 Length 4.0 mm., diameter i.i mm. 



It is a pleasure to name this species for Dr. C. Wythe Cooke, who 

 has devoted a lifetime of energy to the unraveling and elucidation of 

 southeast American Tertiary geology. 



CHRYSALLIDA GARDNERAE, new species 



Plate 15, figure 7 



Shell small, conic, cream-yellow. The nuclear whorls are decollated. 

 The postnuclear whorls are very slightly rounded, almost flattened, 



