. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. 1925] NEW MAMMALS FROM EOCENE OF MONGOLIA Fig. 6. Csenolophus pro^nissus. Upper jaw, external and crown views, natural size. Type specimen, No. 20297. Caenolophus obliquus, new species Type.—No. 20296, upper jaw with dp^-m', part of m^, p^-^ preformed and chamber of m^ Shara Murun
. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. 1925] NEW MAMMALS FROM EOCENE OF MONGOLIA Fig. 6. Csenolophus pro^nissus. Upper jaw, external and crown views, natural size. Type specimen, No. 20297. Caenolophus obliquus, new species Type.—No. 20296, upper jaw with dp^-m', part of m^, p^-^ preformed and chamber of m^ Shara Murun formation, Ula Usu, Mongolia. " Characters.—Larger than the two preceding species; p^-* with strongly oblique transverse crests united at protocone on p^ P^-m= approximately 66 mm.; estimated length of p^-m' = 83 mm. Caenolophus progressus, new species Type.—No. 20298, left upper jaw with m^-^ moderately worn. Same horizon and locality as C. promissus. Species Characters.—Size smaller, m'-' = 35 mm. M^ subtrigonal, the posterior flange of ectoloph vestigial. No. 20309, lower jaw fragment with mi-2 (possibly dpi-nii), may belong to this species, although smaller than the type if the teeth are both permanent molars. It has the same characters as the jaw fragment referred to C. protnissus. Caenolophus ? minimus, new species No. 20310, a jaw fragment with mi-j, represents a species provisionally referable to this genus, but decidedly smaller than any of the preceding. The molars have the same characters as those referred to the preceding species, but the length of mi-2 is mm., of mi-s, estimated at 24 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 Central Asiatic Expeditions (1921-1930); Andrews, Roy Chapman, 1884-1960; Matthew, William Diller, 1871-1930. [New York : American Museum of N
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