360 Notices of Memoirs—Prof. H. G. Seeley, on Fossil Reptilia. 
The evidence in favour of this latter point is of course not decisive. 
But as the natives declare that the ground always cracks along the 
old fault-line whenever there is a severe earthquake, it is probable 
that before long Mr. Egerton and his colleagues may be in a position 
to renew their very interesting observations, and thereby to extend 
our knowledge of the crust-movements that are now taking place. 
IN @TateGAnS (OV IWVE@ iE SS: 
RESEARCHES ON THE STRUCTURE, ORGANIZATION, AND CLASSIFICATION 
oF THE Fossiu Repritia. Part VIII. On Further Evidences 
of Deuterosaurus and Rhopalodon from the Permian Rocks of 
Russia. By Prof. H. G. Suutuy, F.R.S. Royal Society, June 8, 
1893. 
HE author endeavours to separate the Labyrinthodont remains, 
distinguished by having teeth anchylosed to the jaw, from such 
as belong to animals having a Theriodont type of dentition. The 
genera founded upon cranial fragments which show the Theriodont 
type are Deuterosaurus, Rhopalodon, and Dinosaurus. The skull in 
Deuterosaurus is described from new materials, which make known 
the structure of the palate and other cranial structures. The palate 
is of Plesiosaurian type. The back of the skull is a vertical plate, 
and the brain cavity rises in a long vertical tubular mass to the 
parietal foramen. The quadrate bones descend below the foramen 
magnum in a way that is best compared with Plesiosaurs. 
The articular end of the lower jaw is identified among bones 
figured by von Meyer. 
The skull of Rhopalodon is nearly complete, and has a general 
resemblance to the skull of the South African Dicynodont Ptycho- 
gnathus. The orbit is defended with a sclerotic circle of bones. 
Whereas in Deuterosaurus there is only one molar tooth, in Rhopalo- 
don there are apparently eight molar teeth, which have the posterior 
edge finely serrated. 
The vertebre are known from isolated and connected specimens 
which indicate a larger number than usual of rib-bearing presacral 
vertebrae, which appear to be not fewer than nineteen, and may have 
numbered twenty-six. The sacral vertebre are deeply cupped, and 
the sacral ribs are developed as in Nothosaurus and Paretasaurus. 
The sacral ribs form part of the articular face of the first sacral 
vertebra. The pelvis is imperfectly known; the ilium is not so 
looks like one side of a railway embankment about 20 or 30 feet in height. .... . 
Not only is there evidence of subsidence along this line, but there are many evidences 
of horizontal displacement. Lines of roads have been broken, and one part of them 
thrown to the right or left of their original direction ; whilst fields which were 
rectangular have been cut in two, and one-half relative to the other half been shifted 
as much as 18 feet up or down the valley. One result of this is that landowners 
find there has been a partial alteration in the position of their neighbours. A more 
serious change has been the permanent compression of ground, plots which were 
48 feet in length now measuring only 30 feet im length. It appears as if the whole 
Neo Valley had become narrower. A similar effect is noticeable in the river-beds, 
where the piers of bridges are left closer together than they were at the time of 
their construction.’’—Brit. Asso. Rep. 1892, pp. 116, 117. 
eo 
