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NEW YORK STATE MUSEUM 



marginal, at the inner side of the curvature. It is tubular and empty 

 in the fragment at hand. The septal necks did not extend beyond 

 the preceding septum, if we infer properly from the character of the 

 ridges upon the siphuncle. The cameras are solidly filled with 

 organic deposit. The apical part of the conch has not been ob- 

 served. The surface appears to have been smooth and only pro- 

 vided with faint growth lines. 



Position and locality. A single specimen has been obtained 

 by Professor Hudson from the dove-colored limestone (C x ) of Val- 

 cour island. 



Fig. 6 Endoceras(?) hudsoni sp. now Transverse section, x j n 



Observations. E . ? hudsoni shows on one hand relations to 

 E . o p p 1 e t u m and on the other to E. m agister; to the 

 former by the character and amount of the organic deposit in the 

 cameras which exhibits the same peculiar disposition on both sides 

 of the pseudoseptal plane ; and to the latter in the considerable 

 depth of the cameras and the rate of growth. It is nevertheless im- 

 possible to unite this species with either of the two similar forms, 

 since from the former it differs by the curvature of the conch, the 

 greater rate of growth and the greater depth of the cameras, while 

 from E. magi st er it is distinguished by the considerably 

 smaller depth of its chambers, holding in this featurea position mid- 

 way between Vaginoceras o p p 1 e t u m and E . magister. 



