60 TRANSACTIONS OF THE RoOyYAL CANADIAN INSTITUTE. [VOL. XI 
A species of Eotomaria is represented by a single cast of the interior 
embedded in matrix. Two whorls are exposed; the maximum width of 
the first is 12.5 mm. and that of the second is 7 mm. The apical angle 
is the same as that of E. galtensis. The whorls show a sharp edge at 
the inferior periphery and a gently convex upper surface with a slight 
concavity just above the margin. The width of the upper surface from 
the sharp edge of the lower whorl to the suture is 7 mm. The under 
side of the whorl is convex but is rather less pronounced in this respect 
than E. galtensis. The under side of the whorl seems to increase in 
convexity towards the aperture, and as our specimen has lost a con- 
siderable portion of the body whorl, it is likely that the resemblance of 
a more perfect specimen to EL. galtensis would be even more pronounced. 
Locality—Limestone rapids, Severn river, District of Patricia, Ontario. 
Horizon—Silurian. 
No. 357 S. Royal Ontario Museum of Palaeontology. 
EOTOMARIA (?) HOPKINSI, sp. nov. 
Plate I, Figure 5. 
EoToMARIA sp., Parks. Bur. Mines of Ont., 22nd Rep., pt. I, p. 194, 1913. 
This little species is represented by a single cast showing only parts 
of two whorls; its general shape and its resemblance to Eotomaria 
durhamensis, Whiteaves, induces me to ascribe it to that genus. In 
the preliminary report (op. cit.) I compared it directly with E. dur- 
hamensis, but on making a drawing I find that it differs considerably 
in the apical angle and that it apparently has a more elongated aperture. 
The width of the body whorl is 15 mm. and its height 13 mm. The 
second whorl is very much smaller, with a width of only 8 mm. A dis- 
tinct revolving ridge occurs about midway on the whorls, making a sharp 
angulation. Above the ridge the outline of the whorl is rather flat, but 
with a very slight concavity followed by a slight convexity to the suture. 
Beneath the band, the outline is rounded with only the slightest evidence 
of a concavity near the ridge. The outline of the body whorl below the 
band varies greatly as the aperture is approached, becoming much 
steeper in that direction. A more extended knowledge of this species 
might result in its transference to Lophospira: the general shape suggests 
a type like Murchisonia mylitia, Billings, which is now regarded as a 
Lophospira. Named for P. E. Hopkins, who was Mr. Tyrrell’s assistant 
on the exploration of the Severn river. 
Locality—Limestone rapids, Severn river, District of Patricia, Ontario. 
Horizon—Silurian. 
No. 362 S. Royal Ontario Museum of Palaeontology. 
