. Athlon : essays on palaeontology in honour of Loris Shano Russell. Paleontology. Fig. 3 Hyracodon doddi, sp. nov., holotype, unsm 11066, right P4-M-\ a. Buccal view. b. Crown view. Scale = 20 mm. C. Referred specimen, unsm 62072, crown view slightly enlarged. bles closely the late Eocene Epitriplopus medius Peterson from the Duchesne For- mation of Montana. It differs in having a constricted protocone on the molars. Epitriplopus medius also lacks the prominent external cingulum on P4 and is much smaller. In 1964, a specimen was collected from the Chadron Formation at unsm Coll. Loc. dw-107 a
. Athlon : essays on palaeontology in honour of Loris Shano Russell. Paleontology. Fig. 3 Hyracodon doddi, sp. nov., holotype, unsm 11066, right P4-M-\ a. Buccal view. b. Crown view. Scale = 20 mm. C. Referred specimen, unsm 62072, crown view slightly enlarged. bles closely the late Eocene Epitriplopus medius Peterson from the Duchesne For- mation of Montana. It differs in having a constricted protocone on the molars. Epitriplopus medius also lacks the prominent external cingulum on P4 and is much smaller. In 1964, a specimen was collected from the Chadron Formation at unsm Coll. Loc. dw-107 a few miles east of the type locality of H. doddi. The size and pro- portions of this tooth, unsm 62072 (Fig. 3c), suggest that it may be a P3 of H. doddi. The ectoloph is broken off the tooth, as is a portion of the hypocone. The protoloph is large and continuous with the hypocone. The protocone and hypocone are connected by a thick mure. The metaloph is short so that the medial valley opens posteriorly to the rear, but additional wear would seal off the medial valley and isolate a lake just posterior and lingual to the medial valley. The metaloph is posteriorly directed and slightly folded on itself; it bears a labially directed crochet which isolates a small lake posterior and labial to the medial valley. A postfossette. 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 Churcher, C. S. , 1928-; Russell, Loris Shano, 1904-; Royal Ontario Museum. Toronto : ROM
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