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Plate I. 



Ptilolevihis ct foliatus. 



Fig. la. — Posterior end of gladius of a small specimen. The dotted outline indicates 



the probable form when complete. 

 Fig. lb. — Larger specimen, in which little or none of the margin remains. 



Haploceras churchi. 

 Fig. 2. — Left side of outer whorl. The aperture missing. 



TwriteUa tricarinata. 

 Fig. 3. — Enlarged four diameters. Cast of interior, with little of the shell remaining. 



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