168 
T^NIODONTA. 
cementum layer is very thick. The molar is much worn, and has a cyclo- 
tetragonal section. The triturating surface displays no irregularity of form. 
The inferior enamel border is deeply emarginate anteriorly, posteriorly, and 
interiorly. 
The recognizable cranial fragments are few. The condyle of the lower 
jaw has considerable transverse extent, and fragments of the ramus show it 
to have been robust, and with the base of the coronoid process projecting 
laterally, and separated by a ledge from the posterior molars, which extend 
within it. 
A large part of the shaft of the right humerus, with half or more of the 
condylar extremity, is preserved. The former presents a deep bicipital 
groove, with especially wide deltoid ridge. The latter is, in fact, two 
ridges, presenting in opposite directions, with a plane between. There is 
also a postero-external longitudinal angle. The proportions of the hum¬ 
erus were stout, but cannot be exactly determined, owing to the lack of a 
portion of the shaft. The inferior extremity is transversely expanded, dis¬ 
playing a moderate internal epicondyle. The arterial foramen is protected 
by a strong osseous bar, whose convex border projects a little farther than 
the internal tuberosity. The flange bordering the articular condyle within 
is obtuse and moderately prominent. The articular face is strongly con¬ 
cave transversely, but is incomplete in the specimen. 
The ulna and radius are entirely distinct, and the former maintains its 
proportions toward the distal end. Both extremities are wanting in the 
specimen. The shaft is strongly compressed; the inferior margin is 
rounded, and becomes oblique and expanded at the olecranon. The latter 
is well produced, and has an oval triangular section near the end. The 
humeral cotylus is shallow, but well flared on both sides. Tlie inferior 
border of the ulna describes a very gentle sigmoid in profile. The head of 
the radius is flattened-transverse, and is almost, occupied by a nearly uni¬ 
form concavity. The shaft immediately contracts, and soon acquires a sub- 
triangular section, with the external face vertical. It expands again toward 
the distal extremity, which is lost. 
The os magnum is deeper than long behind, and half as long again 
behind as l^efore, where its length is exceeded by the width. Tiie inferior 
