254 Mr. C. W. Andrews on the Structure 
existed, since in some specimens the upper angle is well 
preserved, and shows that it united in a suture with the 
adjoining element. 
Figure showing the relations of the transpalatine to the surrounding 
; bones. 
The anterior edge of the postorbital formed the hinder 
margin of the orbit, and the posterior a part of the anterior 
border of the temporal fossa. Its lower edge, as already 
stated, joins the upper edge of the jugal, while its posterior 
angle is truncated by a short suture with the anterior ramus 
of the squamosal. 
The relations of the postorbital, jugal, and maxilla to one 
another and to the squamosal are almost precisely the same 
as those found by Sollas in a skull of Plestosaurus Conybeart 
(see Quart. Journ. Geol. Soc. vol. xxxvii. 1881, p. 444, 
pl. xxiv. fig. 1); moreover, they bear out Huxley’s statement 
that the postfrontal (=postorbital) articulates with a bone 
that is the homologue of the squamosal of the crocodile. 
Williston, on the other hand, states that in Cimoliosaurus 
there is no trace of the T-shaped suture between the jugal, 
postorbital, and squamosal, and that if it existed the squa- 
mosal would necessarily articulate with the maxilla. This is 
not the case in skulls of Peloneustes, in which the posterior 
end of the maxilla approaches the squamosal, but remains 
separated from it by the jugal. Cope, in his paper on 
the same skull of Cimoliosaurus, describes an arrangement 
of bones in the temporal arch which differs widely from 
that found in Jeloneustes and also in Plestosaurus. He 
figures the suture between the jugal and squamosal as 
lying far back near the hinder end of the temporal arcade, so 
that the postorbital unites with the jugal only, and is widely 
