530 NEW YORK STATE MUSEUM 



Endoceras (?) champlainense sp. nov. 



Page 418 



1 Fragment of siphuncle, showing the smooth area of contact with 



the external wall 



2 Fragment of shell, seen from the same side, showing the rate of 



growth of the siphuncle 



3 Specimen, showing the chambers and the position of the si- 



phuncle. The curving of the siphuncle is accidental and the 

 septa are slightly more convex than represented in the figure 



4 Fragment retaining a partial cast of the living chamber and show- 



ing the depth of the septa 

 The originals are all from the Beekmantown beds at the Spelman 

 ledge (D) at Beekmantown N. Y. and now in the New York State 

 Museum. 



Cameroceras (Proterocameroceras) brainerdi Whitf. (sp.) 



Page 405 

 See pi. 2, fig. I 



5 Section through siphuncle showing its marginal position, thick 



endosipholining and endosiphocoleon 



6 Fragment showing the slight saddles of the sutures opposite the 



siphuncle 

 The originals come from the Fort Cassin beds (A3) at Valcour 

 N. Y. and are now in the New York State Museum. 



1 



