PLATE 36 



Paracyclas elliptica Hall 

 Page 115. 

 Fig. 1. An average specimen. 



(Grand Tower limestone.) 



Pterinea flabellum (Conrad) 

 Page 149. 



Fig. 2. Left valve of a well-preserved specimen. (After Hall.) 



Limoptera macroptera ? (Conrad) 

 Page 154. 

 Fig. 3. A left valve. (After Hall.) 

 Fig. 4. An imperfect left valve. (X}/Q. 



(St. Laurent limestone.) (W. M. 23846.) 



Leptodesma rogersi Hall 

 Page 151. 



Fig. 5. A nearly perfect left valve. (X 5/2). Restoration of the end of the alation 

 slightly incorrect. 



(St. Laurent limestone.) (W. M. 23971.) 



Actinopteria cf. boydi (Conrad) 

 Page 152. 

 Fig. 6. A left valve. (After Hall.) 



Glyptodesma cf. erectum (Conrad) 

 Page 150. 



Fig. 7. An imperfect left valve with hinge line somewhat uncertain. 

 (St. Laurent limestone.) (W. M. 23981.) 



Leiopteria dekayi Hall 

 Page 153. 



Fig. 8. An imperfect left valve. Umbonal part uncertain. 



(Grand Tower limestone.) (W. M. 23889.) 

 Fig. 9. A left valve. (After Hall.) 



