PLATE 19 

 Spirifer arenosus (Conrad) 



Page 83 



i Large smooth internal cast of a ventral valve 



2, 3 Dorsal and profile views of conjoined valves, the ventral valve bein<>- 



preserved as an internal cast 

 4 Internal cast of dorsal valve 



Locality. Cunningham's camp, near Matagamon lake 



Spirifer primaevus Steininger var. atlanticus Clarke 



(Set plate 20) 

 Page 82 



5-12 A series illustrating the internal (5, 6, 9, 10, u) and external (7, 8, 

 12) characters of this shell 



Locality. Tomhegan point, Moosehead lake 



204 



