OF DENISON UNIVERSITY. 
95 
Genus CALYMENE, Brongniart. 
VII. Calymene Vogdesi, sp. n. 
{Plate VIII, Figs. 12, 13, 14, 15, 16.) 
Calymene Blumenbachii ? Brongniart, D. U. Bull., Vol. I, p. no, pL 
XIII, fig. 25. 
Calymene . D. U. Bull., Vol, I, p. 109, pi. XIII, fig. 24. 
Calymene Clintoni, Vogdes, 1882, Acad. Nat. Sc., Phila., Proc., p, 178, 
fig- 3- 
Head semi-circular, moderately convex. Glabella with three lat- 
eral pairs of lobes; the posterior pair triangular-oval and well defined; 
the middle pair half the size of the latter; the anterior pair small. 
Glabella depressed towards the occipital furrow, defined from the an- 
terior half of the fixed cheeks by very deep furrows which merge into 
a groove, defining the anterior part of the glabella, and separating it 
from the anterior border. Palpebral lobes slightly anterior to the mid- 
dle lobes of the glabella. Fixed cheeks and adjacent parts of the 
movable cheeks, greatly elevated, curving rapidly downwards towards 
the sides and furrowed along the border by a deep, broad groove, 
which, anterior to the fixed cheeks, merges into the grooves defining 
the glabella. Just in front of their junction a low tubercle is seen on 
either side of the border. 
The anterior border is quite long, about one-third the length of the 
glabella, depressed posteriorly along the glabella forming a groove, 
otherwise quite flat, not arched in the middle, and elevated at a slight 
angle above the plane formed by the base of the head. Facial sutures 
parallel anterior to the eyes along the fixed cheeks, then curving slight- 
ly outward .and inward again to the anterior edge of the head. 
Thorax trilobate ; the mesial lobe convex ; lateral lobe broader, at 
first horizontal, then curved backwards and downwards; pleurae 
grooved anteriorly, about one-third of the pleura lying in front of the 
groove; extremities of the pleurae unknown. 
Pygidium strongly curved, almost semi-circular anteriorly, moder- 
ately curved posteriorly, almost straight behind the mesial lobe. Mesial 
lobe tapering posteriorly ; the anterior portions indefinitely known on ac- 
count of the broken condition of the specimen, but apparently there is a 
half segment, followed by six segments, terminating in a wedge-shaped 
piece, rounded behind and equal in length to the last three segments. 
Lateral lobes with segments strongly curved to conform with the ante- 
