. Carnegie Institution of Washington publication. 248 FOSSIL TURTLES OF NORTH AMERICA. Mr. Barnuni Brown, on Hell Creek, Montana. Fragments of costals scarcely, if at all, to be distinguisht from them are found in the collection made in the Judith River region for Professor Cope, by C. H. Sternberg, in 1876. It is the writer's opinion that it is unsafe to identify as belonging to Adocus lineolatus specimens from the Judith River and the Laramie beds before far better materials of the species have been collected from the type locality. And when these better materials have been secured from Bijo
. Carnegie Institution of Washington publication. 248 FOSSIL TURTLES OF NORTH AMERICA. Mr. Barnuni Brown, on Hell Creek, Montana. Fragments of costals scarcely, if at all, to be distinguisht from them are found in the collection made in the Judith River region for Professor Cope, by C. H. Sternberg, in 1876. It is the writer's opinion that it is unsafe to identify as belonging to Adocus lineolatus specimens from the Judith River and the Laramie beds before far better materials of the species have been collected from the type locality. And when these better materials have been secured from Bijou Creek, better specimens than yet obtained must be secured from the other formations mentioned. It is improbable that the same species continued from the Judith River epoch to the Arapahoe epoch. Meanwhile, even good fragments are worth preserving. The specimen referred to above as having been collected by Sternberg from the Judith River region forms No. 6105 of the American Museum. It belonged to the third or the fifth costal. Its width is 32 mm.; its thickness, only mm. There is no thickening along the middle on the under side corresponding to the rib. The outer surface is crost by the costo- vertebral sulcus. The ornamentation resembles in pattern that of Cope's Compsemys im- bricaria {Basilemys imbricaria), and Cope has so labeled the bone; but the size of the areolae is considerably smaller, there being 4 pits in a line 5 mm. long, instead of 3 or less. The ridges between the areola? are low and run at right angles with the sutural borders of the bone. A fragment of a costal from Hell Creek, Montana, collected by Mr. Barnum Brown, is catalogged under the number 1014 of the American Museum. The costal is 36 mm. wide and 5 mm. thick . The sculpture is similar to that of the Judith River specimen just described, but is more obscure. A peripheral, the second of the left side, has the number 1014, but it belonged to a much larger individual. It is represented by figs. 308
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