546 ' NEW YORK STATE MUSEUM 



Vaginoceras oppletum sp. nov. 



Page 413 

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



I Enlarged section (x 2) of the cameras and siphuncular wall, 

 showing the extent and structure of the organic deposits and 

 the pseudosepta 

 2, 3 Two views of a fragment of a larger specimen exhibiting well 

 the irregularly mammillate surface of the organic deposits filling 

 the cameras 

 The originals are from the dove-colored Chazy limestone (Q) at 

 the east shore of Valcour island and now in the New York State 

 Museum. 



Baltoceras (?) pusillum sp. nov. 



Page 431 



4, 5 Two views of the type, a natural section ; figure 4 an enlarge- 

 ment (x 3) of the apical end, showing the wide siphuncle 

 The original is from the Fort Cassin beds (A3 of the section on 

 page 397) at Valcour N. Y. and now in the New York State 

 Museum. 



Nanno noveboracum sp. nov. 



Page 427 



6, 7 Two views of the type; the former showing the form and sur- 

 face of the preseptal cone or nepionic bulb ; the latter the si- 

 phuncle (seen from the outside) and early cameras, seen in 

 section 



The original is from the dove-colored Chazy limestone west of Little 

 Monty bay near Chazy and now in the New York State Museum^ 



Endoceras montrealense Billings (sp.) 



Page 424 



8 A specimen showing the rate of growth, marginal position o 



siphuncle, sutures, and depth of cameras and of septa 

 The original is from the Fort Cassin beds at Fort Cassin, and no\i 

 in the museum of Burlington University. 



Orthoceras vagum sp. nov. 



Page 435 

 See pi. 13, fig. I, 2, 3 



9 Section of a portion of the specimen represented on plate 13 



figures I, 2 to show the character of the siphuncle and the deptl 

 of the cameras and of the septa. 



