287 



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t 





(-•• 



'&■''-■■■ ■-"-■■ : C%MM 



Fk;. 22<ia. o. .•cird.sv. l'orti.in of surface 

 enlarged (after Hall). 



X;-i 



2& 





/— 



&'- 



cr>i 



fc- 



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m 



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t 



Fig. 221. Ortho- Fig. 888. o/7/.o- 



Fig. 220. Orthoceras eriense, x ^>. The ceras subiUatum. A ceroa exile. Portion 



living chamber and septa, and a basal specimen with of a specimen (after 



view, showing position of siphuncle (after crushed living Cham- Ball). 



Hall). ber (after Hall). 



