. Bulletin of the Department of Geology. Geology. 1918] Merriam: New Mammalia from the Idaho Formation 527 The Idaho specimen is more slender than N. improvisus, and may show slightly greater lateral compression. It is also more slender, longer and more distinctly flattened transversely than horn-cores of the Recent mountain goat, Oreamnos. Additional material will be re- quired before the position of the species represented by this specimen can be clearly determined. EQUUS IDAHOENSIS, n. sp. Type specimen, an upper cheek-tooth, no. 22348, from locality 3036C in beds referred to the Idaho form
. Bulletin of the Department of Geology. Geology. 1918] Merriam: New Mammalia from the Idaho Formation 527 The Idaho specimen is more slender than N. improvisus, and may show slightly greater lateral compression. It is also more slender, longer and more distinctly flattened transversely than horn-cores of the Recent mountain goat, Oreamnos. Additional material will be re- quired before the position of the species represented by this specimen can be clearly determined. EQUUS IDAHOENSIS, n. sp. Type specimen, an upper cheek-tooth, no. 22348, from locality 3036C in beds referred to the Idaho formation near Froman Ferry on the Snake Eiver, eight miles southwest of Caldwell, Idaho. Referred to this species is also a lower premolar, no. 22347, from beds referred to the Idaho formation at Froman Ferry. Cheek-teeth large and heavily cemented, characters as in typical Equus, excepting in the nature of the protoeone of the upper cheek-teeth and of the inner gutter between metaconid and metastylid columns of the lower cheek- teeth. Protoeone very short anteroposterior^ but distinctly concave on the inner border. Character of the protoeone approaching that of Equus stenonis of the European Pliocene. Gutter on inner border of metaconid-metastylid column of lower cheek-teeth narrow and angular as in Fig. 3. Equus idahoensis, n. sp. P*, occlusal view. Type specimen, no. 22,348, natural size. From beds referred to Idaho formation, near Froman Ferry, Snake River, Idaho. An upper tooth, no. 22348, from locality 3036C in Idaho beds near Froman Ferry on the Snake River represents an animal as large as Equus pacificus or the largest individuals of E. occidcntalis. The crown (fig. 3) is very heavily cemented. Unfortunately it has suffered so much wear that the original length and curvature cannot be esti- mated. The fossettes are very narrow, as might be expected at this stage of wear, and show plications of such extent as to indicate that considerable folding of the walls w
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