— 119 ~ 
parated, indeed, by a relatively wider tract Ihan in 
Ehinosaurus, The orbits are large, distant and inclined 
to the side. As in Ehinosaurus the intervening frontal 
platform equals in breadth the orbital dia- 
meter. The internarial tract is convex (bom- 
be), but differs from that in Ehinosaurus, 
in its greater relative breadth, which equals 
the interorbital tract. The parietals are lar- 
ge, elongate, and show at the fore part of 
the sagittal suture, in the same relative Po- 
sition as in Ehinosaurus, the circular im- 
pression ox'foramen Horneanum, to which 
Fischer de Waldheim specially calls atten- 
tion (p. 5). In the non-extension of the ar 
ticular part of the lower jaw (fig. 2, 29) 
backward beyond the Joint afForded by the 
^granuiata! lympanic dement of the temporal bone (ib. 
28)~-a character which is especially pointed ont as diffe- 
rentiating Ehinosaurus from Enaliosauria and Crocodi- 
Ua—mY South Mrican fossil agrees: and I append a magni- 
fied view of the joint showing the precise relations of the 
articular element, fig. 3, 29, to the tympanic, ib. 28. 
The temporal fossae are completely roofed over by bo- 
ne-plates (fig. 1, extending from the parietals, 7, 
to the zygomatic arches, 27, as in Ehinosaurus: this 
structure I have not seen in any Jurassic Saurian, save 
Ehinosaurus, if this should prove to have been derived 
from the formation specified. But the most marked cha- 
racter of correspondence between the Reptilian skulis 
compared is the layer of finely granulate 'ganoine' cove- 
ring the exterior surface of the skull-bonues, answering 
to that described as al'epiderme plutöt chagrinee ou 
granulee qu'ecailleuse» (loc. cit. p. 5); and which, al- 
