Clarke — The Naples Fauna. 



1G1 



Figures 20, 21, 22. Lateral and dorsal views, with transverse section, of a 

 large fragment from Naples, N. Y. 



Protocoxch of Orthoceras (?). 



Figures 23-25. Three views of the specimen described by the writer as the 

 protoconch of Orthoceras ; here introduced for comparison with the 

 protoconch of Bactrites. x 25. 



From the Styliola limestone, Canandaigua lake. 

 11 



