56 



SYNOrSIS OF AMERICAN FOSSIL BRACHIOPODA. 

 Tablk VI. — Devonian Brachiopoda — Continued. 



[liuu>. 87. 



Eodevonian. 



Species. 



Wliitfieldella (?) harpalyce (Billings) 



Zygospira ( ?) subconcava Meek and Worthen 



Number 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 Oriskany and the 



other divisions 



Number of species 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-Portage 



and the other divisions 



Nvimber of species common to the Chemung 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- 

 kany. 



X 

 X 



129 



Mesodevonian. 



Scho- 

 harie, 

 Cornif- 

 erous. 



104 



15 

 7 



128 



15 



Tully, 

 Hamil- 

 ton, 

 Marcel- 

 lus. 



Neodevonian. 



Port- 

 age, 

 Huron, 

 Gene- 

 see. 



238 



27 



27 



12 



Che- 

 iimng, 

 Ithaca. 



41 

 1 



12 



117 

 2 

 3 

 7 

 22 

 17 



10 



