PUZZLES AND PATRIARCHS. 



203 



pectoral fins, but there are vestiges of the 

 pelvic series. 



The goodly fellowship of the patriarchs in- 

 cludes several forms of deep interest and 

 importance. One of the oldest of these is 



FIG. 17. Three primitive sharks. A. Cladoselache tyleri. B. 

 Acanthodes. C. Pleuracanthus. 



known under the name of Cladoselache and lived 

 during the Devonian period, in the seas of that 

 far away age, which have long ceased to be ; 

 where they swirled and foamed now stands the 

 flourishing State of Ohio. 



The name Cladoselache, being interpreted, 

 means the branch-toothed shark, from the saw- 



