OF DENISON UNIVERSITY 
127 
There are sixteen vertical rows of lenses in the eyes and the largest 
row seems to have contained nine lenses, but this can not be determin- 
ed since the eye seems to be a little injured below. That part of the 
fixed cheek which lies between the eyes and the dorsal furrow seems 
strongly arched, behind the eye this cheek is very narrow and then it 
widens but moderately before meeting the occipital furrow, which 
curves forward along the side of the head and here, meeting the fur- 
row defining the posterior part of the eye, bends forward giving great 
relief to the eye, and running in a much less distinct form along the 
base of the incurved front of the glabella. The occipital lurrow is 
everywhere very distinct. The postero-lateral outlines of the head are 
rounded. The thorax consists of eleven segments, 'The middle lobe 
is almost as broad as the lateral lobes, on account of the quite sudden 
lateral deflection of the pleurae at about half their length. I'he sides 
of the segments of the middle lobe are more or luss curved forward, 
and are slightly thickened. The length of the pygidium is equal to 
about two-thirds its width. The middle lobe of the pygidium at its 
anterior portion is about two-sevenths as broad as the pygidium ; it 
tapers quite rapidly posteriorly. It is marked by seven transverse 
rings of which the sixth is very low and the seventh is very indistinct. 
The pointed tips already mentioned are readily noticeable only on the 
first ring, on the second they are represented by a low granule, on the 
third this becomes indistinct, on the fourth they disappear. The lat- 
eral lobes are marked by six ridges of which the sixth is indistinct, 
d'he first ridge is quite broad and is marked by a well defined although 
shallow furrow. On the second ridge this furrow becomes narrower^ 
on the third it is no longer noticed. The furrows defining the middle 
lobe are distinct and give it a high relief. 
In Prodr. Pal. Victoria, Dec. III. 1876, Prof. McCoy described 
from the Upper Silurian beds at Yering Fh. fecundns, Barrande. 
Since this is the species most closely related to ours we compared our 
specimens with the Bohemian species with the following results. In 
the Bohemian species the compression on each side along the-anterior 
of the glabella is not noticed, this part of the glabella being evenly 
rounded. The anterior lobe of the glabella is characterized by distinct 
narrow lunate furrows, of the arrangement typical with this genus. 
The middle lobe of the pygidium is less tapering posteriorly, and con- 
tains eight well characterized transverse rings in addition to a small 
terminal piece. The ridges or anchylosed segments of the lateral lobes 
