DEVONIAN FAUNAS. 345 
PHOLIDOPS OVATA Hall. 
See, also, p. 226, pl. XX. 
The internal casts of a small species of Pholidops are occasionally 
observed in the Oriskany formation of New Jersey, which apparently 
do not differ in any essential particular from those in the earlier 
faunas which have been identified as P. ovata. : 
STROPHEODONTA MAGNIFICA Hall. 
Plate XLV., Figs. 10-11. 
See, also, p. 324. 
1859. Strophodonta magnifica Hall, Pal. N. Y., vol. III., p. 414, 
pln Is) eke pl 94 hes dd leo oOo Al a 
15-19. 
Description.—Shell subsemi-elliptical in outline, hinge-line equal- 
ing or a little shorter than the greatest width; cardinal extremities 
angular or somewhat rounded. Proportions of length to breadth 
varying from longer than broad to broader than long. Pedicle valve 
depressed-convex near the beak; flattened laterally and anteriorly, 
cardinal margins sloping gently from the beak, cardinal area narrow, 
marked by vertical lines which indicate the position of the marginal 
crenulations. Internally the valve is marked by a large and broadly- 
flabellate muscular impression, beyond which the internal surface is 
papillose, giving to the surface of internal casts a punctate appearance. 
Brachial valve slightly concave or nearly flat. Surface of both valves 
marked by fine, radiating strize, which increase by bifurcation. 
The dimensions of a somewhat distorted specimen are: length, 30 
mm.; width, 34 mm. 
Remarks.—The shell which is identified as Stropheodonta magnifica 
is one of the common members of the Oriskany fauna in New Jersey, 
but it has never been observed to attain the large size ascribed to it by 
Hall. It agrees closely, however, so far as it is preserved, with Hall’s 
illustrations of the smaller specimens of his species, and there can 
scarcely be any doubt as to the specific identity of the New York and 
the New Jersey specimens. The most common occurrence of the species 
