OF DENISON UNIVERSITY. 
II3 
edges of the lateral lobes continue the curvature of the anterior edge 
of the middle lobe, then they make a slow broad inward curvature, the 
posterior edge of the lobes being bounded by a groove continuing that 
part of the occipital furrow extending beneath the middle lobe. 
Within the inw'ard curve of each reniform lateral lobe lies another 
lobe which I shall here call the postero -lateral lobe. Postero-lateral 
lobe separated from the lateral lobe by a sharp groove, its posterior 
edge is defined by a continuation of the groove behind the lateral 
lobes, directed a little backwards, however ; from the palpebral lobe it 
is separated by a distinct groove curved outward and then inward, the 
curve disposed to be angular at its middle. Palpebral lobe preserved 
only anteriorly, its outer lateral edge elevated above the inner, the 
whole palpebral lobe having evidently been elevated along its outer 
surface. Postero-lateral tubercles transversely oblong lanceolate, in- 
serted beneath the lateral and postero-lateral lobes, posteriorly they are 
bounded by the occipital furr./W which bends somewhat backwards 
from the postero-lateral edges of the middle lobe so as to define 
the edges of the tubercles. The posterior edge of the neck segment 
has a very slight forward curvature towards the"! middle. Anterior 
margin of the head narrow. Surface irregularly pustulose. 
Width across the widest part of the middle lobes, 8.6 mm.; across 
the lateral lobes, 9.5 mm.; across the postero-lateral lobes, 11.5 mm.; 
across the postero-lateral tubercles, 8 mm. Distance between the 
tubercles, 4 mm. Length of the middle lobe, 8. 6 ; including the neck 
segment, 10 mm. Stolz’s quarry. 
Another glabella shows only middle, lateral, postero-lateral and 
palpebral lobes, with only a little of the neck segment nearest to the 
occipital lobe. It agrees with the foregoing specimen in all particulars 
as far as can be seen, except in the existence of alow groove across the 
posterior end of the middle lobe where it begins to take an outward 
curvature. This groove is parallel with the occipital furrow just 
behind it. The palpebral lobe is also better preserved and shows a 
regularly rounded outer edge, the surface elevated along the outer 
margin. Surface of the glabella irregularly pustulose. John Browm’s 
Quarry, New Carlisle. Specimen almost twice the size of the last. 
A third specimen (Fig. 26 a) differs widely from the two above in 
some things. It is far more convex, and proportionately wider. 
The grooves about the glabella and the lobes into which it is divided 
also differ materially, more so than the figure intimates, b4t a fuUei: 
