PLATE 5. 
Fig. 1. 46. 3. Macturea macna. (Pag. 26.) 
1 a. The upper surface partially denuded of the shell, showing the strie with the smooth cast beneath. This 
is a perfect representation of the shell, except that the minute terminal volution is not shown. 
1 b. Side view of a cast of the shell, showing the depressed turbinate form and flat spire. 
1 ¢. View of the lower surface, somewhat worn; showing the large umbilicus, which is partially filled with 
stony matter. 
id. A vertical section of the shell, near, but not directly through the centre of the spire ; showing several 
volutions, and the deep umbilicus. Such sections of the shell are not unusual in the rock, and they are 
generally vertical to the lines of deposition. 
1 e. A view of the shell worn down from the lower side, as it very commonly appears upon the weathered 
surfaces of the rock at Chazy. 
