DEVONIAN FAUNAS. 349 
ANOPLIA NUCLEATA (Hall). 
Plate XLVI., Figs. 8-10. 
See, also, p. 325. 
1859. Leptena? nucleata Hall, Pal. N. Y., vol. III., p. 419, pl. 94, 
figs. 1 a—d. 
Description.—Shell small, subsemi-circular or subsemi-elliptical in 
outline, a little wider than long; hinge-line equaling or a little less 
than the greatest width; cardinal extremities angular or obtusely 
rounded. Pedicle valve strongly convex or gibbous, shghtly flattened 
toward the cardinal angles; beak strongly incurved; cardinal area 
narrow, sloping dorsally from the plane of the valve. Internally a 
strong median septum extends anteriorly from the beak for about one- 
third the length of the valve. Surface smooth. 
The dimensions of an average-sized specimen are: length, 5 mm.; 
width, 6.5 mm. 
Remarks.—This little shell has not been observed to occur abun- 
dantly in the Oriskany fauna of New Jersey. Its usual condition of 
preservation is in the form of internal casts, in which the slit, extend- 
ing anteriorly from the beak and representing the medium septum of 
the pedicle valve, is a conspicuous character. 
RHIPIDOMELLA sp. cf. R. MUSCULOSA (Hall). 
13859. Orihis musculosa) EHlalley Pals IN Ye. vols Til p: 409, pk oie 
figs. 1-8, pl. 95, figs. 1-7. 
In an Oriskany fauna from near Layton there have been observed 
a few imperfect specimens of a species of Rhipidomella which may be 
R. musculosa. The specimens are all smaller than the normal, full- 
grown individuals of that species, usually not exceeding 18 mm. in 
length. The characteristic muscular impression has not been ob- 
served, and, although the specimens have a close general resemblance 
to the smaller individuals of R. musculosa, it is difficult to determine 
in what respect they differ from some Helderbergian species. 
