GEOLOGICAL 



SOCIETY 



OF PENNSYLVANIA. 



367 



DESCRIPTION OF FIVE NEW SPECIES OF FOSSIL SHELLS IN 

 THE COLLECTION PRESENTED BY MR EDWARD MILLER 

 TO THE GEOLOGICAL SOCIETY. By T. A. Conrad. 



Stylifer, Sow. 



S. primogenia. PI. 12, fig. 2. Shell ventricosej 

 volutions rounded ; suture well defined ; aperture more 

 than half the length of the shell ; ragirgin of the labium 

 arcuated. 



It is with some doubt that I refer this shell to the ge- 

 nus Stylifer of Sowerby, which has been founded on 

 recent species alone ; but it strongly resembles S. asteri- 

 cola, Sow., except that is much larger ; it has however 

 some of the characters of Paludina, and may possibly have 

 been a fresh water shell. It varies much in outline, as 

 the figures will show. Occurs in slate, and the shell re- 

 placed by crystallized carbonate of lime. 



Turbo, Lam. 



1. T. tabulatus. PI. 12, fig. 1. Shell turrited ; 

 whirls of the spire each with a carinated crenulated line, 

 and numerous spiral wrinkled raised lines ; body whirl 

 concave above, with fine revolving lines ; beneath sub- 

 cancellated, and with distant revolving tuberculated. 

 lines, more numerous at base. 



2. 71 insectus. PI. 12, fig. 4. Shell turbinate, 

 ventricose, with prominent coarse revolving strisB ; 

 whirls convex, flattened above ; aperture orbicular^ about 

 half the length of the shell. 



Found with the preceding fossils, and resembling them 

 in mineral composition. 



