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NEW YORK STATE MUSEUM 



In many cases it appears as if the siphuncular tube may have 

 been absorbed or otherwise removed before the filling of the 

 cavity began. 1 



Among the more abundant species are : 



Orthoceras pel ops [fig. 108], a large robust species 

 with nearly or quite central siphuncle and strongly convex septa; 



Fig. 1 13 C y r t o c eras e u g- e □ i u m 



O . (Acti nocer a s?) 1 u x u m [fig. 109], the most abundant 

 species, characterized by moderately tapering form, close-set 

 septa and expansion of siphuncle between the septa, as well as 

 interseptal organic deposits; O. sty lus [fig. 110], easily recog- 



1 Hall, James. Palaeontology of New York. v. 5, pt2, p.228. 



