PLATE 33 



Spirifer granulosus (Conrad) 

 Page 146. 



Figs. 1, 2, 10. Brachial, pedicle, and side views. (After Hall.) 



Spirifer audaculus (Conrad) 

 Page 145. 

 Figs. 3 and 4. Brachial valves. 

 Fig. 5. An imperfect pedicle valve. 



(St. Laurent limestone) (W. M. 23987). 



Spirifer grieri Hall 

 Page 147. 



Figs. 6-8. Brachial and front views. (After Hall.) 



Spirifer pennatus (Atwater) 

 Page 147. 

 Fig. 9. An imperfect pedicle valve. 



(St. Laurent formation) (W. M. 23979). 



Tropidoleptus carinatus (Conrad) 

 Page 137. 



Figs. 11 and 12. Pedicle and brachial views. (After Hall.) 



