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1905.]

Type.—A skull in the Ottawa Museum from the Edmonton series, from Knee Hills Creek of the Red Deer River, Alberta. Described by Cope (op. cit., p. 240) in 1892, by Lambe in 1904 (op. cit., pp. 1-27, pll. iv, v). Cotype, a smaller skull, Red Deer River, found in 1889, described by Cope in 1892, by Lambe in 1903, 1904 (op. cit., pll. i-iv).

The generic name is assigned in reference to the Province of Alberta, Dominion of Canada, in which these types were found. This animal is more specialized than Deinodon in the reduction of the truncated anterior teeth, and more primitive than Dynamosaurus in the presence of a larger number of teeth and in the less specialized form of the teeth.

Some of the other characters given in Lambe's very full and clear descriptions are as follows: Skull with two openings; lower jaw with a distinct. of cotype long and slender. The teeth are compressed, lenticular in section, in the upper portion of a more rounded oval form, nearer the bases recurved, serrate on both borders. These teeth are thus apparently intermediate in number and structure between those of Dynamosaurus and Deinodon. Lambe determines fifteen mandibular teeth, fourteen of full size, one, the anterior tooth, of smaller size, not, truncated posteriorly, as in Deinodon. He determines twelve maxillary teeth and presumes there were three in the premaxillaries.

This review relates only to the large carnivorous dinosaurs and omits reference to the.