ADDITIONAL NOTES ON THE CAMBRIAN OF CAPE BRETON. 409 
on the ventral side, and shows no keel ; it has from two to three con- 
centric growth ridges in the outer half of the last whorl. 
Sc\dpture . — The outer whorl shows a very fine concentric striation, 
visible only with a strong lens. 
Size . — Height across the whorls, 7 mm.; width across the shell 
from the emargination of the aperture at the ventral side, to the 
dorsum opposite, 4 mm.; width across the aperture from ventral to 
dorsal, mm. 
Dr. Henry Hicks’ species ( B. Ramsayensis), which is about the size 
of this one, may be con-specific with it, but the Welsh specimens are 
too much distorted to be used for satisfactory comparison, and his 
description is brief.* 
Prof. W. C. Broegger figures a species ( Bellerophon Nnrvegicus ), 
from a corresponding horizon in Norway.! It is a little smaller, the 
outer whorl expands more rapidly and is free for half of its length ; it 
is not deeply notched like our species ; though differing in these 
respects, it has a striation similar to the Canadian species, only in 
place of being sharply curved back at the dorsum, the strife curve 
forward in crossing that line. 
Bellerophon Bretonensis, n. sp. PI. XVIII, 4a-d. 
Shell of about two or more whorls, the outer whorl large and 
moderately expanded. Orifice somewhat enlarged and strongly em- 
arginate on the dorsal side by a sharp Y-shaped sinus. Sides of the 
opening strongly aiched upward between the dorsal and ventral sides. 
No distinct keel. 
Sculpture . — The surface is diversified with numerous rounded 
ridges concentric to the umbo, with fiat spaces between ; there is a 
sharp, narrow furrow along the crest of each ridge ; the ridges near 
the orifice are sharper and more crowded than farther back on the 
whorl ; here there are about three in the space of 2 mm., but towards 
the mouth about four. The fine sculpturing of the surface appears 
to be a minute granulation. 
Size . — Length from the inner part of the last whorl to the lateral 
edge of the lip, 20 mm. Width across the shell from the dorsum to 
the inner part of the last whorl, 12 mm. 
* Quart. Jour. Geol. Soc., Londou, vol. xxix, No.' 113, p. 50, pi. iii, figs. 30-32. 
1 Memoir cited, p. 53, pi. x, figs. 15, 15ti, 156. 
