598 



NEW YORK STATE MUSEUM 



Cyrtactinoceras boycii Whitfield (sp.) 



Page 489 



i External view of a specimen to show its rate of growth and 

 curvature 



2, 3 Natural weathered sections in different directions, showing the 

 character and position of the siphuncle and the depth of cameras 

 and septa 



4 Enlargement (x 3) of a portion of the siphuncle of figure 3 

 The original of figure 1 is from the dove-colored upper Chazy lime- 

 stone of Isle La Motte and now in the museum of Burlington 

 University; that of figure 2 is from the upper Chazy (C 6 ) west 

 of Chazy village, that of figures 3 and 4 from the middle Chazy 

 (B ± ) of the same locality. The two last mentioned originals are 

 now in the New York State Museum. 



Cyclostomiceras minimum Whitfield (sp.) 



Page 502 



5 Specimen showing the living chamber, hyponomic sinus, apertural 



contraction and the sutures 



6 Another specimen showing a thickening of the shell that corre- 



sponds to the contraction of the living chamber, and the longi- 

 tudinal striations of the cast 

 The originals are from the Fort Cassin beds at Fort Cassin and now 

 in the Museum of Burlington University. 



Ooceras lativentrum sp. nov. 



Page 497 



7, 8, 9 Lateral, ventral and sectional view of the type 

 10 Lateral view of a fragment of a younger portion of the conch 

 The originals are from the dove-colored upper Chazy limestone of 

 Isle La Motte and now in the museum of Burlington University. 



