PLATE LXXIL 
Bones of the extremities of Mastodon •producUis, one-fourth natural size. 
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Fig. 1. Rig'lit ulna, without epiphyses, outer side; a, the same, from above. 
Fig. 2. Os magnum, from the front; a, from above; b, from l)elow; c, extornal, d, internal side. 
Fig d. Left femur, from the front; a, from the (niter side. 
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