87 



Taile shmoing approximately the Tcnoivn distribution of the chief groups of BracJiiopoda in 



geological time — Continued. 



Trematis, Sharpe . . 

 Orbicvloidea, D'Orbigny 

 Diacina, Lamarck . . 



Craniid^ 



? Pseudocrania, M'Coy 

 Crania, Eetziua . . . 

 Choninpora, Scliauroth 

 Craniscus, Dall . . 

 An^trocrania. Dall . 



Taile of the geological distribution of the knoivn families. 







; 1 



a 



a 



'3 

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p 



3 

 O 

 n 



'3 



o 



1 



a 



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P4 



6 

 H 



1 



3 



to 



3 

 O 



o 



£ 





a 



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LTOPOMATA. 



Craniidce 





















Discinidce 





1 



« 



j 





Lingulidce 









s 











TrimereUidce 

















• 







Siphonotretidce 







Obolidoi 









AETHROPOMATA. 



StropJiomenidce ■ . . . 









Productidce . 





















1 











Spiriferidce . 









Atrypidce . . . 







? 



2 









Pentamcridce . 



1 





Rhynchonellidce 



1 1 







Porambonitidce 

 Terebratub'dce . 



_j . 

















Stringocephalidce 







? 



? 













Thec'd'.idcB . . 

























1 1 



1 





