PLATE 68. 



Page 



Fig. 1, 2, 3. BUCANIA PROFUNDA. 341 



1 a. Dorsal view of a cast, in which the expanded peristome is shown upon the surface of the 

 stone. 



1 b. Lateral view of the same. The representation of the volutions is incorrect. 



2 o. A small specimen in which the expanded portion is broken off. 



2 b. Lateral view of the same. 



3 o. A specimen having a part of the outer volution broken off. 

 3 b. The umbilicus, showing three volutions. 



3 c. Dorsal view of the same, showing an obscure carination. 



