28 



SYNOPSIS OF AMEKICAN FOSSIL BRACIIIOPODA. 

 Table III. — Camhrian Brachiopoda — C'outiuucd. 



[nuLL. 87. 



Species. 



Lower 

 Cam- 

 brian. 



Middle 

 Cani- 

 briiiD. 



Ortliis ( ?) lenticularis "W.ihlenberg 



Orthis ( ?) leuticularis atrypoides Matthew 



Orthis ( ?) lenticularis lyucioidos M.atthew 



Orthis ( !) lenticularis strophonicnoidcs Matthew 



Orthis ( ?) reninichia N. II. "Wincholl 



Orthis ( ?) salemensis "Walcott 



Orthis (?) sandbergm.H. Wiuchell .. 



Orthisina (?) johannensis Matthew 



Protorhyncha ( ?) antiquata (Billings) 



Protorhj'ncha ( ?) minor (Walcott) 



Syntrophia araclino (Billings) 



Syntrophia arethusa (Billings) 



Syntrophia ( ?) armanda (Billings) 



Syntrophia barabuonsis (A. Winchell) 



Syntrophia calcifera (Billings) 



Sj'ntrophia primordialis (Whitfield)  



Treniatobolus insignia Matthew 



Number of Cambrian species, 116. 



Number of species in each division 



Number of species common to the Lower and the other divisions of the 



Cambrian 



Number of species common to the Middle and the other divisions of 



the Cambrian 



Number of species common to the Cambrian and Ordovician system, G. 

 Number of species passing from each division into the Ordovician. . . 



31 



39 



Upper 

 Cam- 

 brian. 



X 

 X 

 X 

 X 

 X 



X 

 X 



X 

 X 

 X 

 X 

 X 

 X 



51 



1 



1 



G 



