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, . Zz mapeee 
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ae oT ear) 
_ aes 
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ee ; 
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P "hh he 
= & ‘ ~~ 
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af 
EXPLANATION OF PLATE Xl. 
AMMONITES (PLACENTACERAS) PLACENTA, De Kay (p. 255). 
Fic. 1. Lateral view of a large specimen, which shows the septa throughont ~ Acad, } 
Phila. ee» | 
378 ‘ * 
bid 
