84 O. C. Marsh on the Affinities of the Brontotheride. 
has no articular face for the lunar. The radius is stout, and 
its distal end expanded. The carpal bones form interlocking 
series. They are shorter than in Hhinoceros, and support four 
well developed toes of nearly equal size. The metacarpal bones 
are shorter than those of the Rhinoceros, the first phalanges 
longer, and the second series shorter. The ungual phalanges 
are short and tubercular, as in the Elephant. 
e femur has a small third trochanter, and its head a deep 
pit for the round ligament. At the distal end, the anterior 
y 
teeth are quite different, while the small canines and huge molars 
contrast strongly with the elongated canine tusks, and diminutive 
molars of the Dinocerata. The latter, moreover, have two very 
large dependent processes on each ramus of the mandible; the 
cervical vertebre flat; the femur without a third trochanter; 
and an additional toe in each foot. 
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