INSTITUTE OF SCIENCE, PHILADELPHIA. 67 



10. The modern fauna of the coast is indisputably a derivative, through 

 successive evolutionary changes, of the pre-existing faunas of the Pliocene 

 and Miocene periods of the same region, and the immediate ancestors of 

 many of the living forms, but slightly differing in specific characters, can 

 be determined among the Pliocene fossils of the Caloosahatchie. The 

 doctrine of evolution thus receives positive, and, most striking, confir- 

 mation from the past invertebrate fauna of the Floridian region. 



11. Man's great antiquity on the peninsula is established beyond a 

 doubt, and not improbably the fossilized remains found on Sarasota Bay, 

 now wholly converted into limonite, represent the most ancient belong- 

 ings of man that have ever been discovered. 



