302 Aug. F. Foerste 
35. Clidophorus planulatus, Conrad 
In the Fifth Annual Report of the Geological Survey of New York, 
published in 1841, Conrad described Nuculites planulata in the 
following terms: 
Compressed; ovate-acute; posterior dorsal margin oblique, rectilinear, 
extremity acutely rounded; basal margin regularly arched; rib oblique. 
Locality. Pulaski, Oswego county. 
In the Paleontology of New York, vol. i, on plate 82, Figs. 9a, h, c, 
and d, all represent specimens of Clidophorus p^anaZa^as collected 
at Turin. Of these, the specimens represented by Fig. 9a are em- 
bedded in an arenaceous slate, associated with Trinucleus con- 
centricus, Zygospira modesta, round and pentagonal columnals of 
crinoids, as at the type locality immediately east of Pulaski, along 
the river. 
The following is a description of specimens collected by the 
writer at the type locality, along the river east of Pulaski, New 
York. 
Shell transversely elliptical oblong, height about half the length 
of the shell, with the beak approximately a third of the length of 
the shell from the anterior end. Umbonal ridge low, distinctly 
defined along its cardinal border where it makes an angle of 162 
to 165 degrees with the longitudinal axis of the shell. Above this 
umbonal ridge, the posterior cardinal slope of the shell is flattened 
and subalate. The posterior part of the hinge-line extends from 
the beak for a distance equalling about two-fifths of the length of 
the shell, and then makes an angle of about 150 degrees with the 
posterior margin of the shell. The margin is rather strongly 
rounded at both the posterior and anterior ends of the shell, 
the maximum curvature of the anterior margin, however, being 
nearer the hinge-line. The basal margin is moderately and evenly 
convex. The clavicular adductor support anterior to the beak 
forms an angle of about 80 degrees with the longitudinal axis of 
the shell; it is comparatively straight and extends downward to 
about the middle height of the shell ; it is sharp and narrow, ap- 
pearing on the cast of the interior of the shell as a sharp incision 
not depressing the immediately adjoining part of the shell. The 
convexity of the shell is moderate, that of a shell 9 mm. in height 
being about 1.6 mm. Specimens 20 mm. in length occur. Com- 
