THE DEVONIAN FOSSILS OF CANADA WEST. 273 
the sides; in outline only gently arched longitudinally; in some 
specimens nearly straight ; the beak small, elongated, erect, and with 
a triangular foramen. Dorsal valve gently convex in the upper half, 
and with a wide shallow sinus in the lower half. Surface smooth. 
Length from two to four lines ; width about three-thirds the length. 
Locality and formation.—Oriskany Sandstone and Corniferous 
Limestone,“County of Haldimand. 
Collector.—J. De Cew. 
CHARIONELLA Crrcxe,—WN. Sp. 
Charionella Circe.—The _ first 
fignre exhibits a specimen with the 
dorsal valve partly removed, shewing 
the internal spires. The other two 
figures are a side and ventral view of 
another specimen. 
Fig. 100. 
Description.—Elongate ovate, greatest width alittle below the mid- 
length, above which the sides converge with a nearly straight or 
gently convex curve to the beak; apical angle between 60° and 75°; 
front half rounded, sometimes slightly truncate in the middle of the 
front margin. Both valves moderately and evenly convex. Ventral 
valve evenly arched from beak to front; beak incurved, but not in 
contact with the dorsal umbo, truncated by a circular aperture 
which is formed below by a deltidium; the sides of the umbo very 
obtusely sub-angular for about one-sixth of the length of the shell. 
Dorsal valve not quite so convex as the ventral, most prominent a 
little above the mid-length; the umbo moderately prominent ; the 
shell narrowed and somewhat pointed towards the beak. Surface 
nearly smooth. 
Length of specimen of average size—eight lines ; width six lines ; 
depth of both valves, four lines; difference between the length of 
dorsal and ventral valves, three-fourths of a line. 
Associated with the above, are specimens of about the same length, 
which are proportionally broader, and with a shallow, mesial sinus 
extending from the front margin of the ventral valve nearly to the 
beak. The sides of the umbo or cardinal slopes are more angular, 
and the beak more prominent. The front margin, instead of being 
rounded, is straight, or even a little concave in the middle. These 
