i.) 
Ftes. 
10,11. Views of a phragmocone showing the septa! markings, Rutgers College. 
: Vie 2 
rn Py : ie, : 
F i a ej 
= ——— x 
7 a nae 
: é des. 
% is 
° ? 
EXPLANATION OF PLATE XLVILI. 
BELEMNITELLA AMERICANA Morton (p. 280). 
1,2. Views of the opposite sides of a small individual fignred by Dr. Morton in his Synopsis 
under the name Belemnites subfusiformis, Acad. Nat. Sci., Phila. 
3. View of a heavy thickened specimen much rounded at the base. Rutgers College. 
4. A smaller specimen, showing the mucronation at the base. Rutgers College. 
5,6. Two views of a very large individual presenting the usual form, Rutgers College. 
7. View of part of the same after having been split longitudinally. 
8. View of a small specimen imperfect at the lower end, but preserving the walls of the 
cavity out to a thin margin. Am. Mus. Nat. History. 
9. View of the filling of the alveolar cavity of the last specimen, showing the thickened ridge 
on the cast on the side opposite to the slit in the stylet. : 
392 
