212 
AUG. F. FOERSTE 
plate 49 represents specimen 12082-1 in the State Museum of 
New York, at Albany. 
12. CAMEROCERAS CONRAD 
Genotype: Cameroceras trentonense Conrad. Pal. New York, vol. 
1, 1847, p. 221 
Cameroceras is distinguished from Endoceras chiefly by the 
character of its endocones, which in Endoceras are long, grad- 
ually tapering, and free from contact with the walls of the siph- 
uncle, except at their extreme top, where, apparently, they are 
attached to the septal necks forming the siphuncle. The general 
outline of these endocones is symmetrical in every direction. In 
Cameroceras the conspicuous part of the endocones is short and 
rapidly tapering. Its straight part is in contact with the ventral 
wall of the siphuncle, while the oblique part faces toward the 
interior and is free from contact with the walls of the siphuncle. 
Immediately above this conspicuous oblique conical part, the 
endocone contracts more or less, sometimes only to a slight de- 
gree. It is not known definitely whether the endocone extends 
above this slightly contracted part for any considerable distance 
or not, but apparently it continues in this direction for a length 
of 6 or more camerae, in cylindrical form. The cylindrical part 
appears to be a continuation of the downward extension of one 
of the septal necks. It is not known whether more than one 
endocone may exist in the same conch. The structure of the 
endocone apparently is very similar to the ‘‘preseptal cone” of 
Nanno and Suecoceras, but the conspicuous rapidly tapering part 
of the endocone is beneath the camerated part of the conch in the 
latter genera, while it is assumed to be surrounded by the camer- 
ated part, some distance above the base of the latter, in Camer- 
oceras. This location in Cameroceras is indicated, among other 
things, by the annulation of the rapidly tapering part of the 
endocone, especially along its free side. 
Although a considerable number of endocones are at hand it 
still remains to determine definitely how much of the overlying 
cylindrical part of the siphuncular portion of the conch belongs 
to the endocone, how the endocone is attached to the interior of 
the siphuncle, and how far above the base of the conch it is 
attached. 
