56 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. [bull. 87. 



Tablk VI. — Deionian llrachiopoda — Contimiod. 



Eodevonian. 



Species. 



"^liitfieldella ( ?) harpalyce (Billings) 



Zygospira ( ?) subconcava Meek and Worthen 



Niiiuber of Devonian species, 663. 



Number of species in each division 



Number of species common to the Lower Helderberg 



and the other divisions 



Number of species common to the Ori.skany and the 



other divisions 



Number of sjiecies common to the Corniferous and 



the other divisions 



Number of species common to the Hamilton and the 



other divisions 



Number of species common to the Genesee-Portago 



and the other divisions 



Number of species common to the Cliemviiii; and the 



other divisions 



Species common to the Devonian and Carboniferous 



."systems, 11. 

 Number of species passing from each division into 



the Carboniferous 



Lower 

 Hel- 

 der- 

 berg. 



Oris- 



Mesodevonian. Neodevonian. 



Scho- 

 harie, 



kany. Corn if 

 erous. 



128 



TuUy, ! Port. 

 Hamil- ; apo, 



ton, j Huron, 

 Marcel- Gene- 



lus. see. 



Che- 

 mung, 

 Ithaca. 



