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GENERAL ORNITHOLOGY 



Birds have been described., Eemains of Birds multiply in 

 the next period, the Tertiary. Those of the Eocene or early 

 Tertiary are largely and longest known from discoveries made 

 in the Paris Basin, among them the Gastornis joarisiensis, at 



Fig. 16.— Restoration of Ichthyomis victor. After Marsh. 



least as large as an ostrich ; some of these belong to extinct 

 genera, others to genera which still flourish ; none are known 

 to have true teeth, or otherwise to be as primitive as the reptile-like 

 forms of the Cretaceous. The Miocene or Middle Tertiary has 

 proved specially rich in remains of Birds, including some of extinct 



