. Carnegie Institution of Washington publication. 302 tortues FOSSILES D'AMÉRIQUE DU NORD. Le professeur Cope nous indique que cette espèce était basée sur des spécimens fragmentaires de 5 ou 6 personnes. Une partie de ces sommes au Musée Américain d'Histoire Naturelle, mais les os figuré par faire face sont à la National Museum à Washington, et avoir le numéro de catalogue 4061. Les types et d'autres spécimens obtenus par faire face ont été recueillis dans les lits de rivière verte de la formation de Wasatch, à Black Buttes, Wyoming, en 1872. Une note dans l'écriture du professeur Cope, accompagnant certains spécimens à Washington, st

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. Carnegie Institution of Washington publication. 302 FOSSIL TURTLES OF NORTH AMERICA. Professor Cope tells us that this species was based on fragmentary specimens of 5 or 6 individuals. Portions of these are now in the American Museum of Natural History, but the bones figured by Cope are in the U. S. National Museum at Washington, and have the catalog number 4061. The types and other specimens obtained by Cope were collected in the Green River beds of the Wasatch formation, at Black Buttes, Wyoming, in 1872. A note in Professor Cope's handwriting, accompanying some specimens at Washington, states that they were found in the first lignite beds of the Eocene at Black Buttes. As stated by Cope, the markt peculiarity of the present species was the broad and abruptly sunken sulci which separated the epidermal scutes. There was a dorsal carina and this was conspicuously intersected by the sulci which crost it. The neurals are relatively broad. Cope gives the length of one as 17 mm. and the width as 18 mm. A neural in the American Museum, No. 1120, is 19 mm. long and 23 mm. wide at the broader end; its thickness at the border for the costal is 5 mm. Sometimes the carina is broader in front of the sulcus which crosses it and sometimes narrower. Sometimes (Cope's figure 32) the sulci are shallow. The neural which furnisht the figure just referred to has a thickness of 5.5 mm.; while the others figured are only about 4 mm. thick at the borders. Cope's fig. 28 does not repre- sent a neural, but probably the hinder suprapygal. If so, the hinder marginal scutes extended upon it. The figure is inverted. Fig. 14, plate 45, is taken from No. 1184 of the American Museum. It is either the third or fifth neural. The peripherals are rather thin, and they flare somewhat upward toward the free border. One figured by Cope (his plate xviii, fig. 29) had a width of 16 mm., a height of 23 mm., and ;. 380. 381. 382. 383. Figs. 380-383.—Echmatemys megaulax. Peripherals and entoplastron. Xi.

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