PLATE 80. 
Fig. 1. 707. 1. Megalomtis canadensis. 
1 a. The anterior half of a large individual, preserving the shell. The line continued, mark; 
the entire valve. 
1 b. View of the anterior extremity, showing the umbones, 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. 
(Pag. 343.) 
s the outline of 
