MAMMAL-LIKE REPTILES, 751 
lacking most of the quadrates, and the anterior part of the face, 
which is only connected with it by documentary evidence (text- 
figs. 8, 9). This specimen also represents a new genus. 
Text-figure 1. 
Pr. Fr. PR. FR. 
Mormosaurus seeleyi, gen. et sp. n. 
R. 3594 B.M.N.H. Type-skull. Right lateral aspect*, X + 
J., Jugal; Lac., Lachrymal; Mx., Maxilla; Na., Nasal; P.O., Postorbital; Pr. 
Pterygoid; Pr.FR., Postfrontal; Pr.FR., Prefrontal; P.Mx., Premaxilla; 
Qu., Quadrate; Qu.J., Quadratojugal; S.Mx., Septomaxilla; Sq., Squa- 
mosal; Tas., Tabulare. 
Although these skulls belong to four different genera, they 
agree so closely in their fundamental architecture that I have 
used them all in the following description, which is, however, 
founded as far as possible on R. 3594, from which the account 
of the face and palate are almost wholly drawn. 
[This method I hold to be perfectly legitimate ; it is as if we 
were describing the characteristic structure of a mammal’s skull 
from incomplete but complementary skulls of a bear, a dog, and 
a cat. 
ite Tapinocephaloid skull (text-figs. 1-9) has an extraordinarily 
large and massive cranial portion beside which the often sharply 
marked off face seems rather feeble. The whole of the bones 
on the dorsal surface of the postorbital region fuse together and 
thicken probably throughout the animal’s life, until as much as 
%* Skulls from the Karroo of South Africa are usually distorted; in many cases 
this is of the nature of a simple sheer, which is very easily corrected in making 
drawings. In the figures of this paper this correction has been made, and each side 
is restored by comparison with the other. Nothing is introduced into them without 
clear evidence on at least one side. All the figures are projections and not perspective 
drawings. 
