9 
NEW DEVONIAN CEPHALOPODA FROM NOVA SCOTIA 
By A . F. Foerste 
Illustration 
Figure 3 . XUustiations of fossils 
Page 
10 
The material studied was embedded in three blocks of coarse and very 
hard sandstone from Bear River district, 2 miles northwest of Clements- 
vale, southwestern Nova Scotia. These contained a considerable number 
of cephalopods, preserved partly in the form of casts of the interior of the 
conch and partly in the form of hollow cavities, the conehs having com- 
pletely weathered away. The hollow cavities, or moulds of the exterior of 
the conchs, usually show the sutures of the septa distinctly. It is evident 
from the lithological character of the rock, and the abundant pelecypod 
fauna enclosed in it that all three chunks came from the same horizon. 
The associated fauna, according to E. M. Kindle, indicates this to be a 
Lower Devonian horizon. 
All of the cephalopods in the material appear to belong to the genus 
Ormoceras Stokes. This genus, typified by Ormoceras bayfieldi Stokes, 
is readily differentiated from typical Actinoceras Bronn, typified by 
Actinoceras bigsbyi Bronn, by its relatively much shorter septal necks. 
Three new species of Ormoceras are present. One of these, Ormoceras 
kindlei , is characterized by its long septal necks. In the other two — 0. nova- 
scoticus and 0. brevicameratus — the septal necks are distinctly shorter. These 
two species are distinguished from each other by differences in their rate 
of enlargement, the apical angle of Ormoceras brevicameratum being con- 
siderably greater than in either of the other two species. 
All of the cephalopods here studied present elliptical cross-sections, 
and more or less oblique sutures of septa, w r hich have probably resulted 
from distortion of the conch after death. Only Orm,oceras brevicameratum 
presents distinct evidence of transverse strlations. 
Species of Ormoceras occur both in Silurian and Devonian strata, but 
since none of the previously known forms is strictly comparable with these 
new species from Nova Scotia, the latter do not serve to indicate the 
horizon of their fauna. 
Ormoceras kindlei sp. nov. 
Figure 3, A, A', and C 
Specimen 175 mm. in length, enlarging from a maximum diameter of 
20 mm. at its base to 28 mm. at a point 75 mm. farther up, indicating an 
apical angle of about 6 degrees. At a point where the maximum diameter 
is estimated at 31-7 mm., the minimum diameter of the conch is 25*5 
mm. Four and a half earner® occur in a length equal to the maximum 
diameter of the conch at the top of the series of earner® counted where 
this diameter is estimated at 28 mm. At this point the concavity of the 
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