EXPLANATION OF PLATE XLIII. 
AMMONITES DELAWARENSIS Morton (p. 252). 
Figs. 1,2. Lateral and profile views of a large specimen from the collection of the Acad. Nat. Sci., 
Phila. The diagram of a septum, Fig 9 on PI. XLIII, is from the outer part of this 
specimen, 
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