540 NEW YORK STATE MUSEUM 



Vaginoceras oppletum sp. nov. 



Page 413 

 See p\. 4, fig. 2, 3; pi. 5, fig. 1-4 



1 Specimen showing the external confluent surface of the deposits 



in the chambers 



Cameroceras tenuiseptum Hall (sp.) 



Page 408 

 See pi. 3, fig. I, 2 ; pi. 4, fig. i ; pi. 5. fig. 5, 6 



2 Natural section through the ventral side of a large specimen. 



Owing to a slight obliquity of the section the outlines of the 



specimen are more rapidly spreading than in the other figures 



The original of figure i is from the dove-colored Chazy limestone 



of the east shore of Valcour island ; that of figure 2, from the 



same bed of the north shore of the same island. The originals 



are in the New York State Museum. 



