PLATYCRINIDiE. 



64S 



Geological and Geographical Distribution. 



Number of knovrn species. 



(Opea figures indicate American ; those marked ( ), European). 



Formation. 



Plattckinid.!. 



1 

 § 



American. 



Approximate 



European 

 Equivalents. 



3 



.9 



o 



o 



■S 



§ 

 o 



o 

 o 

 O 



P 



o 



o 

 O 



^3 



.2 



S 

 1 



o5 



s 



.fe- 

 es 



C 



s 



o 



m 

 3 



g 



"a 

 o 

 .a 



3 



St. Louis. 













2 





Warsaw. 













1 





Keokuk. 



Mountain 

 Limestone. 











4 





Upper Burlington. 











14 



-(26)- 



28 



6 



Lower Burlington. 













Kinderhook. 



Waverly. 



Chouteau. 











10 





g 



o 

 > 



Hamilton. 



Eifel. 





(1) 







1 





Lower Helderberg. 



Grauwaoke. 



(1) 





2 



1 







Is 



t>t/J 



Niagara. 



Wenlook. 

 Gotland. 





1 



(2) 



3(5) 







7^ 

 Total species .... 108 • ,op-\ 



(1) 



1 

 (1) 



2 

 (2) 



4 

 (5) 



60 

 (26) 



6 



