110 
PALAEONTOLOGY OF NEW YORK. 
Proetus stenopyge, n. sp. 
PLATE XXII, FIG. 27. 
Pygidium small, short, transverse; anterior and posterior curves equal. 
Axis wider than one-third the width of the shield, very convex and ele¬ 
vated, sloping to a blunt termination upon the border ; composed of seven 
annulations, each of which, near the axial furrows, is broad, flat and impres¬ 
sed with a faint oblique line, and near the median line is slightly angulated. 
Pleura depressed, nearly fiat; composed of four broad annulations, each of 
which is grooved for its entire length, making the anterior and posterior 
limbs of the same strength. The annulations become obsolete upon the 
border, which is moderately broad, thick and rounded. 
Surface smooth or minutely granulose. Length 3 mm., width 5 mm. 
Specimens of this peculiar form of pygidium are not of common occurrence, 
but are of interest as representing a type of pygidium abundantly developed 
among the Proeti of Germany and Bohemia, as shown in such species as ProHus 
lavigatus, Goldfuss; P. complanatus, P. neglectus, P. Loveni, Barrande., etc. 
Distribution. Upper Helderberg group. Corniferous limestone; Flint Creek, 
township of Phelps, Ontario county; North Cayuga, Province of Ontario. 
Proetus ovifrons, n. sp. 
PLATE XXII, FIGS. 31, 32. 
Several fragments of head-shields showing certain features in common serve 
to separate this form from any described species. 
The glabella is broadly conate, convex, longitudinally arched and closely 
appressed against the narrow anterior margin. The first three pairs of 
lateral furrows are nearly obsolete, the second and third pairs being visible 
only near the marginal sulcus; the fourth pair is very strong and deep, each 
furrow beginning opposite the center of the palpebral lobe and extend¬ 
ing obliquely backward to the occipital furrow, making the basal lobes very 
large, with a length equal to one-third the length of the glabella. The occip- 
