1906 | New SPECIES OF TESTUDO AND BAENA. 195 
tional information regarding the structure of the shelis of these 
forms would be most welcome. 
The type of Plastomenus coalescens is in the museum of the 
Geological Survey at Ottawa, and consists of part of the plastron 
(not parts of the plastron and carapace as stated by Cope in his 
original description, and by Hatcher* in his remarks on the type 
material) of a species that will probably prove to be identical with 
the Belly River series Trionyx that the writer has identified with 
T. vagans, Cope. Dr. O. P. Hay, of the American Museum of 
Natural History, New York, found, in 1901, undoubted contact 
between the piece that had been described as belonging to the 
carapace and the larger portion that had been rightly considered 
as part of the plastron, the complete specimen representing a con- 
siderable portion of the right hyo—and hypoplastral bones with 
the sutural division between them clearly indicated. 
The types of Plastomenus costatus, Cope, and Compsemys 
ogmius, Cope, are also in the museum of the Geological Survey at 
Ottawa. 
The material on which P. cosfatus is based is very fragmentary 
but the sculpture shewn on part of a costal boue is quite different 
from that of any species from this horizon known to the writer. 
The sculpture will no doubt prove to be sufficiently characteristic 
for the identification of any additional parts of the carapace that 
may be discovered. 
Compsemys ogmius, Cope, (type specimens at Ottawa) is, as 
was pointed out by the writer in 1902,** probably identical with 
Basilemys variolosus but the specimens are fragmentary and so 
poorly preserved, although Mr. Hatcher in his 1905 report referred 
to them as ‘‘ fairly good material,” that the specific name ogmzus 
has not been made use of by the writer. The name varzolosus is 
identified with well preserved material representing the greater 
portions of both the carapace and plastron. The name ogmzus has 
been used in connection with the description of two small and 
poorly preserved weathered fragments of the shell of a species that 
* Geology and Paleontology of the Judith River beds, 1905, p. 74. 
** Contr. to Canadian Palzeont., vol. III (quarto), pt. II, 1902. 
