EXPLANATION OF PLATE XXVI. 
Fic. 
63. BELEMNITES Bessinus. (From Stonesfield.) 
/ 
v’. Ventral aspect of a specimen, showing the phragmocone 7 situ, and the 
groove continued over it. 
s’, 8’. Cross sections of the sheath. ; 
v’. Ventral aspect of a large specimen in the Oxford Museum. 
vy”. Similar view of a small specimen. 
Another specimen of intermediate size. 
/”. Lateral view of the same. 
s”. Cross section of the alveolar chamber. 
64. BELEMNITES ARI-PISTILLUM. (From Stonesfield.) 
v’. Ventral aspect with phragmocone, 2” seti. 
s’. Sections across the guard. 
v”. Small specimen; s”, its cross section. 
x”. Specimen of one somewhat larger. 
v” Largest example which has been observed by the author. In Mr. J. 
Parker’s Collection. 
