454 EXERCISES ON THE DEVONIAN GROUP. 



Figure 191 represents the Coccosteus. . This remarkable fish 

 had a large head, covered with osseous plates, the mouth 

 armed with small conical teeth, and the body terminated in 

 a long flexible tail ; it possessed an anal and dorsal fin, but 

 had no pectorals ; three species are known. For a most 

 interesting and graphic description of these fishes, the 

 student should consult Mr. Millar's work, already quoted, 

 and especially the able monograph by Professor Agassiz, on 

 the fishes of the old red sandstone. 



EXEECISES 



ON THE DEVONIAN GROUP. 



1. Describe the authors and collections. 



2. State the general characteristics. 



3. Mention its geographical distribution. 



4. Describe its organic remains, and follow the usual 

 method of question and reply. 





