﻿129 Florida Oligocene Shells i i 



Cornell University collection. 



Named in honor of Professor Van den Broeck, Director of 

 the Geological Survey of Belgium. 



Mangilia Clara?, n. s. 

 PI. Ill, fig. i. 



Shell small, slender, acute, seven- whorled, the two nuclear 

 smooth and full ; spiral sculpture consisting only of a few fine 

 threads extending over the lower half of the body whorl ; trans- 

 verse sculpture of slightly oblique ribs (seven on the last whorl) , 

 most prominent at the periphery of the whorls. Length of shell 

 6.5 ; greatest width 2.5 mm. 



Chipola marls, Bailey's Ferry, Florida. 



Cornell University collection. 



Mangilia Websteri, n. s. 

 PI. Ill, fig. 2. 



Shell very slender with seven whorls of which the two 

 nuclear are smooth : body-whorl slightly less than half the length 

 of the shell ; transverse sculpture of nearly straight, elevated, 

 prominent ribs, of which there are eight on the body-whorl (in- 

 cluding the varix); spiral sculpture of close-set threads, tending 

 to alternate in size, which cover the whole surface of the shell 

 except the nuclear whorls. 



Length of shell 8 ; of aperture 3 ; of body-whorl 4.5 ; great- 

 est width 3 mm. 



Chipola Oligocene, Bailey's Ferry, Florida. 



Cornell University collection. 



Dedicated to Dr. David Webster, of New York City. 



Mangilia Isabella:, n. s. 

 PI. HI, fig. 3- 

 Shell short, fusiform, whorls seven of which the two nuclear 

 are smooth ; body-whorl more than half the length of the shell ; 

 transverse sculpture of prominent, somewhat flexuous ribs (eight 

 on the last whorl including the varix at the aperture) ; spiral 

 sculpture of exceedingly fine raised threads, visible only with a 



