AECTIC ORDOVICIAN AND SILURIAN CEPHALOPODS. 269 
figure 38a and figure 38b the direction of lengthwise curvature is 
opposite to that of the specimen itself. The latter consists of 
part of a phragmacone, exposing on one side the septa, which are 
only moderately concave. The sutures occupy the grooves 
between the annulations, the latter occurring at mid-height of 
the camerae. The siphuncle is relatively large, having a diame- 
ter of 6 mm. at the top of the specimen, where the diameter of 
the conch is 17 mm. 
The second specimen figured by Billings, numbered 7455a 
in the collections of the Geological Survey of Canada, was ob- 
tained in Oxford township, in Greenville county, Quebec. In 
a length of 57 mm. it contains 20 annulations. The diameter 
at the top of the specimen is 18 mm.; here the diameter of the 
siphuncle is 7.2 mm. ; and the center of the siphuncle is 8 mm. 
from the nearest wall of the conch, so that its location is only 
slightly excentric. In specimen 7456b, from the same locality, 
the center of the siphuncle is four-elevenths of. the diameter of 
the conch from its nearest wall, thus indicating a greater amount 
of excentricity. Specimen 7456 consists of a phragmacone 110 
mm. long, with an estimated diameter of 23 at the larger end. 
Full grown specimens probably attained diameters of at least 
30 mm. 
Specimen 550b, from the same locality as the first figured 
specimen, apparently has funnels descending for at least the 
depth of one camera. 
Specimens 508 and 508a, from Romaine on the Gulf of St. 
Lawrence, apparently indicate obscurely that the lower end 
of each funnel is inserted for a short distance into the top of 
the funnel next beneath. 
Locality and Horizon. — Found in various counties in the eas- 
tern part of the province of Quebec, and on the Mingan islands 
and on Newfoundland, in the Canadian formation. Also in 
the Beekmantown of New York. 
