PARASTRAPOTHERIUM 145 
pit. Behind the posterior lobe is a small basin, bounded 
in the rear by a second crista from the rear end of the 
external wall, which, as the tooth is worn down, unites 
with the posterior lobes, cutting off a small posterior pit, 
suggestive of that of homalodontotheres. 
The three lower incisors are expanded at their ends into 
thick shovel-like crowns, each with a strong crescentic 
cingulum on the posterior face, and with a shallow furrow 
on both the front and back faces. Relatively the incisors 
are much larger and longer than in Astropotherium. 
The lower canine is flattened on the upper face, so that 
its cross section is close to semicircular making a typical 
permanently growing rooting implement. This tooth is 
relatively shorter and smaller than in Astrapotherium. 
Premolars I and 2 are wanting, a long diastema occupy- 
ing the interval between the canine and pm. 3. Premolar 
3 is greatly reduced in size, and in my specimen has fallen 
out, being represented by a small alveolus. I judge that 
in old individuals it falls out. The fourth premolar and 
the molars are typically those of Toxodontia. The young 
show two plump crescents, with a low plump pillar, sit- 
uated near the anterior horn of the posterior crescent, 
which pillar, as the tooth wears, unites with the anterior 
horn. 
The scapula is a remarkably heavy and elongated bone, 
greatly arched where it lay over the ribs. The spine is 
high and heavy, with the upper margin developed into 
a thick ridge like a banister rail, which is prolonged in 
front to, or a little beyond, the level of the glenoid fossa, 
this distal portion being expanded into a broad plate more 
than half as wide as the widest portion of the blade of the 
scapula. The glenoid fossa is relatively small, oval in 
outline, and with the long axis parallel to the long axis 
of the body. The anterior margin of the articular surface 
is reflexed, apparently to come in contact with the base of 
the greater tuberosity of the humerus. This glenoid cavity 
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