266 
AUG. F. FOERSTE 
The siphuncle is narrow and is in contact with the ventral 
wall of the conch; apparently it is slightly flattened by its con- 
tact with the latter. At the base of the specimen, where the 
diameter of the conch is estimated at 9 mm., the diameter of 
the siphuncle is about 1.4 mm. in a lateral direction. Laterally 
the segments of the siphuncle present slightly concave vertical 
outlines. If these segments represent downward continuations 
of the septal necks, then the latter descend the length of a single 
camera and they invaginate into the top of the septal necks 
next beneath. No trace of surface ornamentation is preserved. 
Locality and Horizon. — From the Orthoceras limestone at 
Victoria Head on Bache peninsula, on Ellesmer eland, west of 
Smith Sound. Regarded as of Canadian age. In the Pal- 
aeontologisk Museum, Kristiania, Norway. Collected by Per 
Schei in May, 1899. 
• Remarks. — The species here described as Ellesmer oceras 
scheii has about the same apical angle as Endoceras montrealense 
(Billings) as figured by Ruedemann (Bull. New York State 
Museum, 1906, p. 424, pi. 9, fig. 8); the number of its camerae 
is also about the same, but in the latter species the sutures of the 
septa curve distinctly downward on approaching the siphuncle 
along the median part of the ventral side of the conch, and the 
relative size of the siphuncle is much greater. 
In the upward curvature of the sutures of the septa on approach- 
ing the siphuncle Ellesmer oceras scheii resembles. Eremoceras 
syphax but the apical angle of the latter is much greater, its 
form is slightly cyrtoceraconic due chiefly to lengthwise curva- 
ture along the dorsal side, and the siphuncle is much larger, 
tapers much more rapidly toward its apical end, and is appressed 
for a greater part of its width against the ventral wall of the 
conch. 
Ellesmeroceras is regarded as a straight Endoceratitic shell 
with a relatively small siphuncle; the sutures rise on approaching 
the siphuncle, and the latter is in contact with the ventral wall 
of the conch. In true Endoceras the sutures do not rise in a 
conspicuous manner on approaching the siphuncle but are more 
nearly directly transverse. While I am doubtful as to the gen- 
