Eastsia>". — Diiiichthys. 



PLATE 5. 



rig. 1. Postero-ventro median plate of an unknown Dinichthyid species. X § 

 (approximately). M. C. Z., Cat. No. 1475. This plate is preserved in 

 counterpart, and a portion of the bone adheres to the opposite side. 



Fig. 2. Dinkhthys (?) bohemkus (Barr.). X \. Middle Devonian (Etage Ggi) ; 

 Chotec, Bohemia. M. C. Z., Cat. No. 1376. Detached dorso-median 

 plate, more highly arched and rounded in outline than that shown in 

 Plate 2, Fig. 3, but having the same ornamentation. The carinal 

 process is slender, and appears only in section where the matrix has 

 been ground away. 



Fig. 3. Dorso-median plate of a young individual representing an unknown 

 Dinichthyid species, seen from the under side. X |. Cleveland 

 Shale ; vicinity of Cleveland, Ohio. Original preserved in Museum 

 of Oberlin College. 



Fig. 4. Dinkhthjs elfeUensis Kayser. X i :Middle Devonian ; EifeL District. 

 Internal aspect of right antero-ventro-lateral plate. M. C. Z., Cat. 

 No. 1474. 



