PLATE 35 



Strophalosia truncata (Hall) 

 Page 141. 



Figs. 1 and 2. Exteriors of pedicle valves. (After Hall.) 

 Fig. 3. Exterior of a brachial valve. 

 Fig. 4. Exterior of a pedicle valve. 



(St. Laurent limestone.) (W. M. 23977.) 



Craniella cf. hamiltoniae (Hall.) 

 Page 133. 

 Fig. 5. An imperfect valve. 



(Grand Tower limestone.) (W. M. 23881.) 



Cyrtina alpenensis Hall and Clarke 

 Page 148. 



Fig. 6. A side view. (After Hall and Clarke.) 

 Fig. 7. Side view of a pedicle valve. 

 Fig. 8. Front view of a pedicle valve. 



(St. Laurent limestone.) (W. M. 23961.) 



Pholidops cf. oblata Hall 

 Page 133. 



Fig. 9. An impression of a brachial valve. 



(St. Laurent limestone.) (W. M. 23969.) 



Productella spinidicosta Hall 

 Page 141. 



Figs. 10 and 12. Two views of pedicle valves. (After Hall.) 

 Fig. 11. A pedicle valve. 



(Grand Tower limestone.) (W. M. 23882.) 



Chonetes mucronatus (.Hall) 

 Page 141. 



Fig. 13. A pedicle valve. (After Hall.) 

 Fig. 14. A pedicle valve from the St. Laurent formation. 

 (W. M. 23875.) 



Leptostrophia per plana (Conrad) 

 Page 135. 



Fig. 15. A pedicle valve. (After Hall.) 

 Fig. 16. An imperfect brachial valve. 



(St. Laurent formation.) (W. M. 23965.) 



Platyceras carinatum Hall 

 Page 156. 



Figs. 17 and 18. Two views of the best specimens in the collections. 

 (Grand Tower limestone.) (W. M. 23891.) 



