298 
AUG. F. FOEESTE 
suggesting that at least part of the flattening may be due to 
compression during lossilization. 
The sutures of the septa apparently incline from the dorsal 
toward the ventral side of the conch at an angle of* about 75° 
with the dorsal side of the conch, which suggests an angle of 
about 85° with the ventral side; however, the rate of inclination 
is only an estimate. The location of the siphuncle is 22 mm. 
from the dorsal wall at the top of the specimen, where the lateral 
diameter is 68 mm.; on the ventral side the siphuncle probably 
was in contact with the ventral wall of the conch, and even may 
have suffered a certain amount of flattening there. At the top 
of the specimen the lateral diameter of the siphuncle is estimated 
at 43 mm.; at its base it probably was 33 or 34 mm., indicating 
an increase in width of 10 or 11 mm. in a length of 125 mm., 
or an apical angle of about 5 degrees. In a length equal to the 
lateral diameter of the conch there are 6 camerae; in a length 
equal to the lateral diameter of the siphuncle there are about 
4 camerae or at least nearly that number. 
At the top of the specimen, where the vertical distance between 
the septa along the siphuncle is 10 mm., the short tubular necks 
of the septa extend downward 4.5 mm., the connecting rings 
joining successive septal necks having a vertical lengths of 5.5 
mm. These connecting rings or annulations extend abruptly 
outward beyond the tubular septal necks for distances of 4.5 
mm. The septa practically are in contact with the lower sur- 
face of the annular segments of the siphuncle for a distance of 
4 mm. from the upper margin of the septal necks. Along this 
part of their course they form an angle of about 60° with the 
dorsal side of the siphuncle, rising 17 mm. in passing from the 
upper margin of the septal necks to the dorsal wall of the conch. 
Calcareous deposits fill the interior of the annulations along the 
lower part of the specimen, but along the upper part of the latter 
the distal part of the annulations is occupied only by the same 
sort of matrix which has filtered also into the camerae, indicating 
that it was unoccupied at the time of the death of the animal. 
From the interiors of these annulations the calcareous deposits 
extend nearly horizontally inward for 3 or 4 mm. toward the 
interior of the siphuncle. 
