Morgan Expeditions. 112 
ing at first at an angle of about 120°, and curving moderately and regularly ; 
posterior lateral angle on either side produced backward in an acute 
spine. On each side of the frontal lobe the margins sometimes form 
nearly straight lines. The entire margin forms a curve, nearly equal to 
half an eltipse, in which the relation between the two diameters is 
about as 2 to 3. A specimen rather below the medium size measures: 
greatest length, 14°5™™; greatest width, about 20™™. A larger specimen 
has a length of about 21™™, 
Glabella very prominent, slightly flattened on top, bounded by deep 
axal furrows, sub-pentagonal in outline, and rounded or sub-angular in 
front; widest just back of the middle of the frontal lobe, or at about, 
one-third the length of the glabella from the front. Thence backward 
the glabella narrows regularly, the width at occipital furrow being a 
little more than half the length of the glabella. Frontal lobe rounded 
or sub-angular at front and sides and very convex, curving strongly 
downward toward the margins of the head, and sometimes obliquely 
flattened on either side in front. Its length equals about the united 
length of the four succeeding pairs of lobes, and a little more than two- 
thirds its own width. Frontal furrows wider than middle and basal 
furrows. Originating at a distance from the front equal to about one- 
third the length of the entire glabella, they run inward and backward 
at a strong angle, terminating near the middle of axis. They reach a 
little more than one-third across the glabella. Upper and middle lobes 
wider and more prominent than the basal lobe. Middle furrows situated 
at a distance from the front equal to about 3-5 the length of glabella, 
deep and rather narrow, perpendicular to axis, and extending inward 
quite as far as the frontal furrows. Basal furrows deep, curving a little 
forward, and reaching to about one-third the distance across glabella, 
or slightly farther than do the middle furrows. Basal lobes narrow 
and much less prominent than the other lobes. Occipital furrow deep, 
broad and rounded. Occipital ring broad, strongly arched vertically 
and sub-angular behind. The highest part of the glabella is situated 
at a point about between the middle furrows. On the median line, 
and slightly in advance of frontal furrows, is a minute, more or less 
distinct depression, usually more marked in the internal cast. 
Limb forming a blunt, rounded or sub-angular projection in front of 
glabella, but narrowing down to a mere line before reaching the axal 
furrows. Cheeks very convex, with a strong convex slope toward the 
margins; slope toward neck and axal furrows abrupt. The limb increases 
rather rapidly in size going backward from the axal furrows, being sep- 
arated from cheek lobe by a well defined, broad furrow. The occipital 
furrow is inclined slightly backward, and is deep and well defined, not 
being extended into the nuchal spine, which last is short, acuminate 
and not differentiated from cheek. Length of spine, measuring from 
angle formed by lateral and occipital furrows, equal to about half the 
length of glabella. Spines directed slightly outward. Posterior mar- 
