83 



Table showing approximateltf the known distribufion of the chief groujps of Brachicpoda in 



geological time. 





B 



ca 



P 

 a 



'S 



o 

 o 







g 

 § 



d 



.s 



'a 



(2 



.3 



a 



2 



3 

 1-5 



p 1 



c 



o 



o 



ca 



© 



5 







Teeebeatulid^ 

















1 







Terebratula, Miiller. 



? 



i 1 1 1 



1 



\ 







Gentrovella^ Billings 



„ 





















• 



Titulina, Hall 







„_^ 























Tropidoleptus, Hall ....... 







■ 























Meganteris, Suess 





























Epithyris, King 







Waldhcimia Kinjc {=Eudesia) . . . 









• 







? 











Lyra, Cumberland 











Pygope, Link 











1 ,,| 







Orthotoma, Qiienstedt 





























Terebratulina, D'Orbigny 







Hynniphoria, Suess 



__» . 1 . 





Terebratella, D'Orbigny 





















1 





Megerlia, King . 



1 8 





Megathyris, Broun 



1 



1 



Gistella, Gray 





















1 ? 







Trigonosemus, Konig 

















. 





Magas, Sowerby 



























? 





lihynckora, Dalman 







Magasella, Dall 





e^KM^ 



Laqueus, Dall 



























? 





? Fre7iula,'DaM 































Bouchardia, Davidson 





























,__- 



Platidia, Costa 































JBTrawssijia, Davidson 





































X 



X 



X 





^ 



X 



X 



X 



X 









X 



? 

 ? 



1 

 ? 



X 







1 





Thecidium, Sowerby 









1 





X 



X 



X 



X 



X 



Strlngocephtalid^ 





X 





X 



X 



X 



X 



X 







Stringocephalus, Sandberger .... 









X 



X 



Pextamerid^ 





















Pentamerus, Sowerby 







i 









1 



i 



i 



1 







Oonchidium, Linn6 





1 . 







Stricklandia, Billings 





J 



















! 







