578 NEW YORK STATE MUSEUM 



Deltoceras vaningeni sp. nov. 



Page 480 

 See pi. 26, 27, 28 



I Exterior view of the type ; showing the rate of growth, the depth 



of chambers, direction of sutures and evohition of the gerontic 



Hving chamber 



The original is from the lower Chazy limestone (B4 of the section 



on page 398) at the Valcour shore and now in the New York 



State Museum. 



