MAMMAL-LIKE REPTILES. 767 
The restoration of the skeleton (text-fig. 15) founded on all this 
material gives one an idea, which is probably generally correct, of 
the habit of the group. The striking features are the small head 
and very massive limb-girdles. Phocosaurus is relatively more 
heavily built than “ Pariasaurus” baine. 
Text-figure 15. 
Restoration of the skeleton of a Tapinocephaloid. 
Skull, humerus, femur, and tibia from the type of Pnigalion oweni ; 
other bones from the type of Phocosaurus. 
Dentition and Systematics of Tapinocephaloids. 
The type-specimen of TZapinocephalus atherstoner has been 
ground down so as to show many sections of uncut tooth-crowns 
and of the roots of functional teeth, Judging from these the 
teeth are similar all round the upper jaw, there being no enlarged 
canine. 
The teeth-crowns, as shown by the series of sections which cut 
them at many levels, consist of a sharp upstanding cusp, the outer 
side of which is rounded and the inner side flattened ; from the 
lower border of this cusp the crown is continued inwards on a 
large shallowly concave area surrounded by ridges descending from 
the sides of the anterior cusp ; these seem to be smooth, and the 
outer is the larger. An isolated tooth (text-fig. 16, B) in the 
Museum collection seems to agree with the tooth-crown restored 
from the sections shown in this type-specimen. 
R. 3594, which may be called 
Mormosaurus seeleyi, gen. et. sp. n. (Pl. IV.), 
has an extremely feeble dentition, which is quite uniform 
throughout so far as can be judged from the usually imperfect 
crowns and alveoli. Each tooth seems to consist solely of a cusp 
which is oval in section and has a coarsely serrated edge. 
R. 3596 may be called 
Prigalion owent, gen. et sp. n. 
The dentition of the upper jaw is not known, but there is no 
sign of an enlarged canine in the dentary. The teeth seem to 
be similar all round the mouth. Each tooth consists of a high 
