NEW SPECTES OF DIPLODUS TEETH 493 
complicated in one way or another in the beginning, eventually 
becoming more simplified. But, although mutual resemblances 
and even intergradations exist, these all seem to be due to paral- 
lelism of adaptive modifications. 
C. R. Eastman. 
MUSEUM OF COMPARATIVE ZOOLOGY, 
Cambridge, Mass. 
EXPLANATIONS OF FIGURES. 
Fic. 1,2. Dzplodus priscus sp. nov. Anterior face. 
Fic. 3. Diplodus striatus sp. nov. Anterior face. 
Fic. 4. Diplodus striatus sp. nov. Anterior and posterior views of a large 
detached cone, apparently belonging to same species as Fig. 3. Originals of Figs. 
1-4 from Upper Devonian, near Elmhurst, Ill. 
Fic. 5. Phoebodus politus Newb. Anterior face. Cleveland Shale, Lorain 
county, Ohio. Original in Museum of Comparative Zodlogy, Cambridge, Mass. 
All figures enlarged five times the natural size. 
