THE DEVONIAN FOSSILS OF CANADA WEST. 261 
greatly developed that it rises above the hinge-line to a height equal 
to nearly one-half the length of the whole valve. Sometimes the 
beak of the ventral valve is incurved down nearly to the dorsal umbo, 
but in general there is a space of about half a line intervening. 
Locality and formation.—This species has been found rather com- 
mon on lot 43, concession 2, township of Middleton, in the Cornifer- 
ous Limestone. According to Prof. Hall, it occurs “in the limestone 
of the Upper Heldenberg, (Onondaga and Corniferous) rarely in 
Eastern New York, common in Genesee and Erie counties, and in 
Ohio and Kentucky, in the same geological position.” 
I am indebted to Dr. B. F. Shumand for specimens from the Falls 
of the Ohio for comparison. These are more convex than any of 
ours, but of about the same size. 
Collector.—J. De Cew. 
SprRIFERA PARRYANA.—Hall. 
SprRiFER PARRYANUS.—(Hall.) Geology of Iowa, Vol. 1., page 
509. Plate 4, fig 8 a, 6. 
Fig. 77. Fig. 78. 
Fig. 77. Spirifera parryana.—Dorsal view. Fig.78. Side view of the same. 
Description.—Transversely sub-elliptical or sub-quadrate ; cardinal 
angles generally rounded ; sides and front angles rounded ; front mar- 
gin somewhat straight or a little concave for about one-third the 
width in the middle. Both valves rather strongly convex, giving a 
sub-globose form to the whole shell ; mesial fold and sinus rounded, 
and extending to the beaks. Area of ventral valve somewhat arcuate, 
and forming an angle of about 48° to the plane of the lateral margins. 
Surface with about eighteen flat, rounded ribs, separated by grooves 
one-fourth the width of the ribs; mesial fold and sinus not ribbed. 
