299 
include distinctive parts, this specimen would have been regarded as be- 
longing to B. variolosa. A species not certainly identified occurs in the 
Hell Creek beds. During the past season an undescribed, closely related 
species was discovered in the Lance Creek deposits in Converse County, 
Wyoming, by a member of the U. S. Geological Survey. Nothing re- 
sembling these turtles has ever been found in beds above those equivalent 
to the Lance Creek deposits. Indeed, all those turtles of the Upper Cre- 
taceous which had the carapace and plastron sculptured in various ways, 
appear to have become extinct before the beginning of the Tertiary. Not 
long after the opening of the Tertiary, in the Wasatch, there came in the 
Emydidee and the Testudinidz, and these developed other styles of orna- 
mentation of the shell. 
Figures of all the species of turtles named above are to be found in the 
present writer’s “Fossil Turtles of North America.” 
Dinosaurs.—Both in the Judith River beds and in those of the Lance 
Creek epoch the most abundant and the most conspicuous reptiles are the 
dinosaurs. Five families of these, belonging to four superfamilies and to 
two suborders, are represented in the Judith River epoch, and each of these 
families reappears in the Lance Creek epoch. Furthermore, many of the 
genera are common to the two formations and it is believed that the same 
is true of a considerable number of species. From the Judith River beds 
Cope described eight species of carnivorous dinosaurs that seem to come 
under the genus Dryptosawrus. Mr. Hatcher (Bull. U. 8S. Geol. Surv., 
257, p. 86) mentions the occurrence of two of these, called by him Deinodon 
éxplanatus and D. hazenianus, in the Lance Creek beds. Another car- 
nivorous dinosaur, Deinodon horridus, was originally described from the 
Judith River beds. Hatcher (loc. cit., p. 838, Aublysodon mirandus) be- 
lieved that it was found likewise in the Lance Creek beds. Another, 
Zapsalis abradens, is thought (p. 84) to occur in both formations. The 
great carnivorous dinosaur described by Osborn, Tyrannosaurus rer, May 
be a descendant of Marsh’s Ornithomimus grandis, of the Eagle formation, 
older still than the Judith beds. 
In the herbivorous order Orthopoda are placed the remarkable rep- 
tiles called the Stegosauria. Two species, Troodon formosus and Pala@o- 
scincus costatus, are mentioned by Hatcher (loc. cit., pp. 83, 88) as being 
represented in the Lance Creek deposits by numerous teeth of size and 
pattern similar to the types, which were described from the Judith River 
