Fia. 
EXPLANATION OF PLATE XXI. 
53. BELEMNITES ELLIPTICUS. 
Lateral view of specimen in the Bristol Institution, from Dundry. 
Ventral aspect of the same, showing the greatly compressed shape. 
Lateral view, showing rugose extremity, and trace of lateral groove. 
Lateral view, showing worn surface, and groove near the apex. 
Outline of the ventral aspect. 
Cross section of the same. 
_ View of a septum with the siphuncle, showing its unusually elliptical 
outline. 
Side view of two septa. 
Side view of phragmocone, with the conothecal lamin. 
Striation on the conotheca; s”, one of the septa of ¢’; s”, another 
septum. 
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