﻿131 Florida Oligocene Shells 13 



three are smooth, the remainder ornamented with longitudinal 

 riblets (seven on the last whorl) and very fine spiral striae visible 

 only with a lens. Last whorl more than half the length of the 

 shell ; aperture and canal narrow ; outer lip simple with no in- 

 ternal lirae. Length of shell 4.5 ; greatest width 2 mm. 



Dedicated to the Greek geographer Strabo who first appre- 

 ciated the significance of fossil remains. 



Oak Grove, Santa Rosa County, Florida. 



Mr. Aldrich's collection. 



Mangilia Tar?-i, n. s. 

 PI. Ill, fig. 7. 



Shell small, slender, acute, six-whorled exclusive of the 

 eroded nucleus; body whorl slightly more than half the length of 

 the shell ; suture distinct, somewhat wavy ; sculpture consisting 

 only of longitudinal flexuous riblets or waves of which there are 

 six on the last whorl ; aperture narrow ; outer lip with internal 

 lirae ; callus moderate. Length of shell 6 ; greatest width 2 mm. 



Named in honor of Professor Tarr of Cornell University. 



Oak Grove, Santa Rose County, Florida. 



Mr. Aldrich's collection. 



Clathurella nemorensis, n. s. 

 PI. Ill, fig. 8. 



Shell small, slender, spire acute, whorls seven, of which the 

 first two are smooth, the third with a single carination near the 

 base, and the remaining four cancellated by the intersections of 

 numerous fine spiral threads with slightly more widely separated 

 fine longitudinal riblets. Aperture slightly less than one-third 

 the total length of the shell. Sinus profound, U-shaped. Outer, 

 lip bearing an external varix and four plications within. Col- 

 umella with three denticles. Length of shell 4.5 ; greatest 

 width 2 mm. 



Oak Grove, Santa Rosa County, Florida. 



Mr. Aldrich's collection. 



