EXPLANATION OF PLATE XLV. 



TURRILITKS PAUPER Whitf. (p. 268). 



Figs. 1,2. Views of the opposite sides of the specimen described. 

 3,4. Upper and lower views of tbo same specimen. 

 5. Diagram of a septum, twice enlarged. This was accidentally shaded below instead of 

 above the line as is done in case of other diagrams. 



Ptychoceras (Solenoceras) annulifer Morton (p. 273). 



6, 7, 8. Dorsal, ventral, and lateral views, twice enlarged, of the specimen used by Dr. Morton in 

 the original description. Acad. Nat. Sci., Phila. 



Heterococeras Conradi Morton (p. 269). 



9, 10, 11. Profile, upper and lower views of Dr. Morton's type. Acad. Nat. Sci., Phila. 

 13, 13. Lower and profllo views of another specimen, being the deflected enter chamber only, the 

 elevated end showing evidences of the last septum. This is from the Atlantic High- 

 lands of New Jersey, and is from Columbia College collection. 

 14. A fragment of another outer chamber from the Acad. Nat, Sci., Phila. 

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