22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



rounded and provided with strong, decidedly protractively slanting 

 axial ribs which are of equal strength from the summit to the 

 periphery, where they terminate. Of these ribs 15 are present upon 

 the last whorl of the type. The gouged-out intercostal spaces are a 

 little narrower than the ribs and, like these, terminate at the periphery. 

 Suture strongly impressed, rendered wavy by the strong axial ribs. 

 Periphery well rounded. Base short, well rounded, smooth. Aperture 

 obliquely subquadrate, columella moderately strong, provided with 

 an oblique spiral fold a little anterior to its insertion, outer lip 

 fractured. 



The type, U.S.N.M. No. 561615, comes from the Pliocene beds 

 of North St. Petersburg, Fla. It has 6.5 whorls remaining which 

 measure: Length 3.1 mm., diameter i mm. 



TURBONILLA (CHEMNITZIA) lOLAUSI, new species 

 Plate 3, figure 3 



Shell small, elongate-turrited, stout, cream-yellow. The nucleus 

 consists of about 2.5 strongly rounded whorls that form an elevated 

 spire whose axis is at right angles to that of the postnuclear turns, 

 in the first of which the last whorl is about one-third immersed. The 

 postnuclear whorls are moderately rounded. They are crossed by 

 strong, sinuously curved, strongly protractively slanting axial ribs 

 that terminate at the periphery. The impressed intercostal spaces, 

 which are about as wide as the ribs, also terminate at the periphery. 

 Of the axial ribs 15 are present on the last whorl of the type. The 

 suture is well impressed, rendered wavy by the strong summit of the 

 ribs. The periphery is well rounded. The base is short, well rounded, 

 smooth. The aperature is subquadrate; the columella bears a feeble 

 spiral fold at its insertion. 



The type, U.S.N.M. No. 561616, comes from the Pliocene de- 

 posits of North St. Petersburg, Fla. It is a complete specimen, having 

 6.5 postnuclear whorls, and measures: Length 2i-l mm., diameter 

 I mm. 



TURBONILLA (CHEMNINZIA) HYDRA, new species 



Plate 3, figure 9 



Shell elongate-turrited, cream-yellow, large. The nucleus consists 

 of 2.5 strongly rounded smooth turns that form a well-elevated spire 

 whose axis is at right angles to that of the postnuclear whorls, in the 

 first of which the last nuclear turn is about one-fourth immersed. 

 The postnuclear whorls are flattened and crossed by very strong 



