PLATE 80. • 



Fig. 1. 707. 1. Megalomus canadensis. (Pag. 343.) 



1 a. The anterior half of a large individual, preserving the shell. The line coutinued, marks the outline of 



the entire valve. 

 1 h. View of the anterior extremity, showing the iimbones, and a part of the dorsal margin. 

 1 c. The dorsal side of the same specimen. 

 1 d. A fragment of the left valve of another specimen. 

 1 e. Dorsal view of a cast of this species. 



