38 Batrachia of the Permian Period of North America. (Januaty, i 
Besides Cricotus, Fritsch describes a genus from Bohemia 
under the name Diplovertebron, which I suspect to belong to the © 
Embolomeri. 
In the family Cricotida the chorda dorsalis is persistent and 
large. The vertebral centra and intercentra are perforated so as 
to resemble some kinds of discoidal beads. They form a charat- 
PIEN 
teristic feature among the Permian fossils. The abdomen is pro- 
tected by scales arranged in chevrons. There is a parietal fora: l 
men, and the supratemporal bone has a free external border like f 
the squamosal of the crocodile. 
a 
b 
FIG. 7.-—Cricotus heteroclitus Cope, the specimen figured on Plate v. Fig. 4 
ing 
from above, one-half nat. size, end of muzzle wanting; 4, abdominal surface, soi | 
scuta, distal extremity of femur and distal three phalanges of a digit, one- -half nat . 
Cricotus Cope. 
In this genus the teeth are rather large, and are of p 
size in the external rows. The tail is long, and was apparent? 
as 
useful as a natatory organ. The terminal phalanges are on 
in salamanders, and without claws. The pelvis has the cna 
of that of the Eryopidz, but is less massive anteriorly. 
