336 ASSINNIBOINE AND SASKATCHEWAN EXPEDITION". 



but is much more compressed, and longer in proportion 

 to its height. 



Inoceramus Canadensis. — Left valve. 



It also bears some resemblance to I. regularise D'Orbigny, 



Eight valve. The finer concentric lines represent shading. The small figure x 4 

 shows the fine striae seen on the outer fibrous layer of the shell, magnified four 

 times. 



