1913] 



The Ottawa Naturalist. 



105 



1886, p. 150, pi. 16, fig. 7; 10th Ann. Rept. U. S. G. S., 1891, 

 p. 629, pi. 80, fig. 7, 7a. Microdiscusl nobilis. Vogdes, Am. 

 Geol., 1892, 4, p. 383. 



9 



im 



' 7 



c 



8 



11 



10 



14 



o 



15 



16 



Explanation of Figures. 



1. Eodiscus punctatus (Salter). Middle Cambrian, Wales. 

 After Lake. 



