﻿145 Florida Oligocene Shells 27 



Erato chipolana, n. s. 

 PI. VI, fig. 9. 

 Shell small, pear-shaped, highly polished ; aperture very 

 narrow ; outer lip finely crenulate within ; columella with a 

 slight fold at the base in adult shells. 



Length of shell 4 ; of aperture 3.5 ; greatest width 3 mm. 

 Chipola Oligocene, Bailey's Ferry, Florida. 

 Cornell University collection. 



Rim el la Aldrichi, u. s. 

 PI. VII, fig. 1. 



Shell slender, fusiform, immature, with nine whorls of 

 which the first four are smooth, the fifth bears longitudinal riblets 

 and the remaining whorls are ornamented with longitudinal rib- 

 lets (sixteen on the last whorl) and closely set spiral threads. 

 Some of the specimens bear one or two varices. Length of 

 largest shell 12 ; greatest width 4 mm. 



Oak Grove, Santa Rose County, Florida. 



Mr. Aldrich's collection. 



Bittium Judsoui, n. s. 

 PI. VII, fig. 2. 



Shell small, slender, acute, with seven to eight convex 

 whorls, of which the first two are smooth and the remainder 

 strongly sculptured. Spiral sculpture of raised threads (eight on 

 the body-whorl and three or four on the preceding whorls) ; 

 longitudinal sculpture of fine riblets (twelve on the body-whorl) 

 and a single varix not far from the margin of the lip. Aperture 

 oval ; outer lip simple ; thin, with no internal lirge. Length of 

 shell 4 ; greatest width 1 mm. • 



Named in honor of Dr. Judson of Dobbs Ferry, New York. 



Oak Grove, Florida. 



Mr. Aldrich's collection. 



Cerithiopsis, Ogi Ivies, n. s. 



PI.' VII, fig. 3. 



Shell small, slender, acute, with twelve whorls of which the 



