MAMMAL-LIKE REPTILES. 761 
The stapes (St.) in all Deinocephalia is a massive rod with few 
features; in 49385 it apparently fuses with the posterior lip of 
the fenestra ovalis. In R. 3596 it is of extraordinary size; the 
distal end, which is directly and powerfully articulated with the 
quadrate, being nearly 5 centimetres wide and 2 thick. It is not 
perforated for a stapedial artery. 
Text-figure 9. 
—— 
= 
ta 
PAR 
—— S 
Type-skull of Lamiasaurus newtoni, external aspect of the bones of 
the brain-case. 
Reference-letters as before, with :—Eru., Ethmoid; E.Pr., Epipterygoid; Par.Sp., 
Parasphenoid; Prr., Pituitary fossa; VII., 1-foramen fallopii. 
The Tapinocephaloid lower jaw is represented in the British 
Museum only by the two dentaries of R. 3596 (text-fig. 16, A); 
as Dr. Broom has recently published an account of the jaw this 
lack is of little importance. 
