STUDY OF THE GRAPTOLITES. 



225 



TABLE 



Showing the Geological Distribution of the Species of Graptolitidce in 

 Canada and the United States — (Concluded). 



GENERA AND SPECIES. 



a 



03 



o 



o 



3 



»\ 

 m 

 S 

 O 

 u 



«§ 



a 



o 



a 



U 



H 



1 

 'u \ 



a 1 c^ 



a 



o 



o 



a 



bO 



be 



a 

 o 



Lower Helderberg. 

 Uppe r H eiderbe rg . 



a 

 S 



a 



w 



be 

 a 



s 



i 



• 



01 



a 



O 



"S 



o 



03 



Genus Dictyonema, Hall. 













* 



.. 





.. 



» 



• . 





hnmilt.oniaft. ri.s.. TT... ........ ......... 

















irrpcnlaris. TT.. ..••••. ........... 





* 

 » 



* 



" 





• • 



* 



* 



* 



•• 









miirrn.vi. TT........ ...... ...... 







TlfiftTlfl.h. W ...............•••• 







duadrangularis. H •...• 





* 





retiforinisj H., 







websteriji H 









* 

 * 



" 



•• 





Genus Ptilograptus, Hall. 





* 

 * 



* 



•• 





plumosus. H...... .»••»• «..,•••• 







Genus Thamnograptus, Hall. 



T. anna, H« ••.... 







capillariS} H • ..•■ 







typuSj H • 











Genus Rastrites, Barrande. 



R . barrandi; H 





•• 



♦ 





Genus Buthograptus, Hall. 



B. laxusj H ••...•... 







Genus Inocaulis, Hall. 



I. plumulosa^ H ••••• 









Genus Oldhamia [?], Forbes. 



0. fruticosa H. •••.. 







* 



" 



•• 



• • 





i '1 







t Nova Scotia. 



[Assem. No. 239.] 



29 



