130 
ORECJDONTA. 
of tlie convexity. Within this is a prominent ledge giving this portion of 
the crown a broadly rounded form. A strong external cingulum. Length 
of crown, 0“.0075; width of crown, 0“.009 ; elevation of crown, 0“.0040. 
A cervical vertebra displays the usual vertebral foramen and deflected 
parapophyses. The centrum is depressed, and has oblique articular extremi¬ 
ties, and is longer than wide. Its inferior face is prominent along the 
median line; the low rib dividing posteriorly into two sublateral longi¬ 
tudinal ridges, which form angles on the infeiior border of the articular 
face. The centra of the dorsal vertebrae are considerably smaller than that 
of the cervical, and are strongly and regularly convex below. The anterior 
are relatively wider, equaling the cervical in transverse diameter, but being 
smaller in the longitudinal. The caudals are slender, finally having a 
quadrangular section, the angles representing the arches and diapophyses. 
All parts of the humerus are preserved. The proximal tuberosities are 
not protuberant above, but the greater is continued into a large deltoid 
crest. This crest is very prominent, and has a flat margin, which terminates 
rather abruptly near the middle of the shaft. From its terminus, its flat 
border widens upward, so as to include the entire width of the great 
tuberosity. The distal end of the humerus is much expanded in the plane 
of a line drawn between the middle of the lesser and the posterior border 
of the great tuberosity. Its inner epicondyle is greatly developed, so as to 
measure two-fifths the distal diameter. The arterial foramen is remarkably 
large, and the supra-condylar fossae shallow and not perforate. The con¬ 
dylar surface has a projecting border, which separates it- from the inner 
condyle from front to rear, but is bounded at the outer extremity by such 
a rim on the posterior aspect only; the articular face extending to the 
external limit of the bone on the anterior face. 
The ulna is shallow, and with a convex inferior border in the antero¬ 
posterior direction. The inferior border is thickened, so as to produce a 
longitudinal concavity on each side of the shaft. This thickening becomes 
a wide transverse expansion of the inferior side of the olecranon, so that 
the width of this part equals its elevation. The superior margin of the 
olecranon is acute and incurved ; the extremity wide and truncate. The 
surface of attachment of the proximal end of the radius is flat. The distal 
