1915] PALAEOZOIC FOSSILS FROM HupsoNn Bay. 65 
probably a mould of the umbilical side of the same species; it shows 
lines of growth and evidence of an alar expansion. 
Locality—Assina rapids, Severn river, District of Patricia, Ontario. 
Horizon—Silurian. 
No. 352 S. Royal Ontario Museum of Palaeontology. 
PYCNOMPHALUS COLEMANI, sp. nov, 
Plate I, Figures 9 and 10. Plate VII, Figure 3. 
This species is represented by a single imperfect specimen from 
which the upper part of the spire has been removed by erosion; it is 
nevertheless sufficiently preserved to justify the creation of a new 
species. 
The specimen is about 85 mm, in diameter and shows an excellent 
cast of the base (Plate I, Fig. 10). The upper side is very imperfect 
and shows only the outer whorl and a trace of the margin of the second 
whorl; it will be understood, therefore, that Plate I, Figure 9 is largely 
restored. The casts of the whorls are of oval shape with a ratio of 5 to 3 
in the lateral and vertical diameters. 
A vertical section shows sufficient of the shell to indicate clearly 
the reference of the species to Pycnomphalus. The long and upwardly 
curved callosities are indicated in dotted lines on Plate VII, Figure 3. 
The upper callosity on the left and the one on the right of the figure 
are actually preserved; the lower one on the left is restored. The inner 
ring shown on Plate I, Figure 10 rests on the upper side of the basal 
callosity. 
This species differs so distinctly from P. salaroides, Whiteaves, or- 
from any of the species figured by Lindstrém from Gotland that no 
comparative remarks are required. Named for Dr. A. P. Coleman, 
Professor of Geology, University of Toronto. 
Locality—Limestone rapids, Severn river, District of Patricia, Ontario. 
Horizon—Silurian. 
No. 347 S. Royal Ontario Museum of Palaeontology. 
PYCNOMPHALUS, sp. indet. 
Plate VII, Figure 9. 
This species is represented by one water-worn fragment, which 
is so ill preserved that nothing of the external characters is shown. A 
vertical section, however, shows that the shell is about 45 mm. in dia- 
meter, that the spire is but slightly elevated, that the volutions are 
rather sharply angulated at the periphery, rounded below, and slightly 
impressed above by the next whorl. The basal whorl bears a distinct 
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