Ill) PALAEONTOLOGY OF NEW YORK. 



Proetus stenopvge, 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 flat; composed of four broad annulations, each of 

 which is grooved for its entire length, making the anterior and posterior 

 liinhs 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 Proetus 

 lavigatus, Goldfuss; P. rnmpJanatus, P. negledus, 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- 

 er 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- 



