. Athlon : essays on palaeontology in honour of Loris Shano Russell. Paleontology. 214 NEW OLIGOCENE RHINOCEROTOIDS Discussion The two hyracodontids closest both geographically and temporally to P. hudsoni are Hyracodon priscidens petersoni and H. selenidens. Comparison of the holo- types of these two forms (cm 3572 and ypm 1173 respectively) indicate that they both differ from Penetrigonias hudsoni in that: they are smaller; they are more hypsodont; their metalophs are more closely associated with the hypocone than with the protocone; their protocones are not isolated cusps before wear; and t
. Athlon : essays on palaeontology in honour of Loris Shano Russell. Paleontology. 214 NEW OLIGOCENE RHINOCEROTOIDS Discussion The two hyracodontids closest both geographically and temporally to P. hudsoni are Hyracodon priscidens petersoni and H. selenidens. Comparison of the holo- types of these two forms (cm 3572 and ypm 1173 respectively) indicate that they both differ from Penetrigonias hudsoni in that: they are smaller; they are more hypsodont; their metalophs are more closely associated with the hypocone than with the protocone; their protocones are not isolated cusps before wear; and they have external cingula and lighter internal B. 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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