. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson : A New Titanothere from the Uinta Eocene. 43 deltoid groove is deep and well defined, as in the Oligocene genus. On the other hand the deltoid ridge, though very prominent, does not terminate in the heavy recurved process as in T. validum, but descends much more gently towards the supratrochlear fossa. Distally there is less variation between the two forms here compared. The anconeal fossa in the spe- cies under description is rela- tively broader and the supina- tor ridge is less r
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson : A New Titanothere from the Uinta Eocene. 43 deltoid groove is deep and well defined, as in the Oligocene genus. On the other hand the deltoid ridge, though very prominent, does not terminate in the heavy recurved process as in T. validum, but descends much more gently towards the supratrochlear fossa. Distally there is less variation between the two forms here compared. The anconeal fossa in the spe- cies under description is rela- tively broader and the supina- tor ridge is less rugose. The trochlea is slightly deeper, but not more oblique than in T. validum. The humerus as described and figured by Osborn holds an intermediate position be- tween the Oligocene genus and the present form. This is es- pecially shown in the develop- ment of the deltoid ridge, which in the Princeton specimen is considerably more developed than in the genus under de- scription. Measurements. Humerus. No. 2860, No. 2861, Mm. Mm. Length from head to distal end 365 3^5 Transverse diameter of lower part of deltoid ridge loS''' no" Transverse diameter at broadest portion of supinator ridge, iis 113 Transverse diameter of distal trochlea 78 Both radii and ulnae are represented in No. 2860. A third radius was also found in the same sandstone ledge in close proximity to the spot where Nos. 2858 and 2859 were found. The radius and ulna are long and relatively slender, when compared with those of the Princeton specimen of Diplacodon and the Oligocene " The shafts of the two bones are more or less crushed and the measurement is only approximately Fig. 8. 2 Diploceras osborni Peterson. (Paratype. No. 2860.) X i- Humerus, i, anterior view; 2, posterior Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
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