NO. 2 PYRAMIDELLID MOLLUSKS — BARTSCH 21 



sinuous, protractively slanting axial ribs, which extend equally strong 

 from the summit to the periphery. The excavated intercostal spaces 

 are not quite so wide as the axial ribs and terminate abruptly at the 

 periphery. Suture strongly impressed, rendered somewhat wavy by 

 the strong summit of the axial ribs. Periphery well rounded; base 

 rather short, well rounded, without sculpture. The last whorl of the 

 type has i8 axial ribs. Aperture obliquely subquadrate, columella 

 rather stout, bearing a spiral fold near its insertion. 



The type, U.S.N.M. No. 561612, comes from the Pliocene beds of 

 the North St. Petersburg, Fla., deposits. It is a broken specimen, 

 having 13.5 whorls and measures: Length 8 mm., diameter 1.5 mm. 

 Two additional specimens from the same source are in the collection 

 of the A.N.S.P. 



TURBONILLA (CHEMNITZIA) ADONISI, new species 

 Plate 3, figure 8 



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

 consists of about 2.5 strongly rounded whorls that form a moderately 

 elevated helicoid spire whose axis is at right angles to that of the post- 

 nuclear whorls, in the first of which the last whorl is about one-fourth 

 immersed. The postnuclear whorls are moderately rounded and 

 crossed by strong vertical axial ribs that terminate at the periphery. 

 The impressed intercostal spaces are about as wide as the ribs and, 

 like these, terminate at the periphery. The suture is strongly im- 

 pressed and rendered wavy by the strong termination of the axial 

 ribs at the summit. The type bears 18 axial ribs on the last whorl. 

 The periphery is strongly rounded, and the base is short, well rounded, 

 and smooth. The aperture is obliquely subquadrate, and the columella 

 bears a weak fold near its insertion which renders it somewhat 

 flexuose. 



The type, U.S.N.M. No. 561613, comes from the Pliocene deposits 

 of North St. Petersburg, Fla. It has lost the early whorls; the 11.3 

 remaining measure: Length 8 mm., diameter 2 mm. U.S.N.M. 

 No. 561614 contains three topotypes from the same source, one of 

 which has furnished the description of the nucleus. Five additional 

 specimens are in the collection of the A.N.S.P. 



TURBONILLA (CHEMNITZIA) ALCMENA, new species 



Plate 3, figure i 



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

 and early postnuclear whorls are lost ; those remaining are moderately 



