138 
PALEONTOLOGY OF NEW YORK. 
concave; frontal margin elevated, rising to the height of the glabella, broad, 
thickened and rounded. Palpebral lobes conspicuous. 
Glabella sub-pyriform, convex, slightly flattened above, bounded by a sul¬ 
cus which is strong at the sides and obsolete in front. Baso-lateral lobes 
strong; antero-lateral impressions well marked. 
Cheeks appressed and elevated along the lateral margins of the glabella. 
Thorax not observed. 
Pygidium semicircular ; length to width as 1 to 2. 
Axis prominent, elevated and longitudinally arched; width less than one- 
third that of the shield, rapidly tapering to an apex just within the posterior 
border; composed of nine annulations which are transverse, rounded and 
separated by moderately broad sulci. 
Pleura evenly rounding to the flattened border, and bearing seven annula¬ 
tions, which are strongly sulcate. Border broad, depressed or flat. All the 
pleural annulations pass over the border to its edge, where the anterior and 
posterior limbs are of equal strength. Doublure broad. 
Surface Ornamentation. The cephalon shows traces of low pustules over 
the glabella, and upon the depressed frontal area, where they become elongate 
or lachrymate, sometimes anastomosing, leaving elongate depressions between 
them; the frontal border also bears an irregular row of conspicuous tubercles. 
The pygidium is marked by regularly arranged pustules; a median row upon 
the axis, bifurcating at the fifth or sixth annulation, thence backward con¬ 
tinuing double until it becomes obsolete. Pour rows of finer pustules are 
also visible on the axis, two on either side of the median row. The pleurae 
bear three or four rows of small pustules, and the interspaces of the crust 
are minutely granulose, and punctate. The lower surface of the doublure is 
marked by faint radiating or venate striations. 
Dimensions. The single fragment of the cephalon has a length of 7 mm.; 
the pygidium measures 6 mm. in length and 9 mm. in width. 
