ANOMODONT REPTILES. 



357 



Pristerodon raniceps (Owen) *. (Text-fig. 2.) 



In 1876 Owen briefly described, under the name Oudenodon 

 raniceps, a small skull and jaws from the same locality, East 

 London, as Huxley's type. Owen gives no figiu-e of the specimens, 

 but merely describes the skull as follows : — " The occipital condyle 

 is low and broad ; the lateral portions contributed by the 

 exoccipitals simulate the Batrachian double condyle. The supra- 

 occipital surface is much depressed. The temporal fossae are large, 

 with the long diameter lengthwise. The orbits appear to have 

 been small." 



Text-fiijure 2. 



Frontal and pai^ietal regions in Tristerodon ranicejps (Owen). Xat. size. 

 B.M., R 1650. 



Lydekker, in his Catalogue of 1890, refers the specimens 

 doubtfully to Udenodon baim Ow., believing that they were of 

 a young individual. 



It is rather remarkable that both Owen and Lydekker should 

 have referred the' specimens to Oudenoden, seeing that a consider- 

 able number of teeth are well exposed to view in the lower jaw. 

 The teeth agree closely with those of Pristerodon mckayi^ but 

 the denticulations are relatively rather coarser, 



The skull is much crushed, but probably measured about 

 92 mm. from the snout to the plane across the posterior borders of 

 the squamosals, and the greatest breadth is about 80 mm. The 

 interorbital measurement is 16 mm. and the intertemporal 28 mm. 

 The antorbital portion of the skull appears to be relatively shorter 

 than in Pristerodon mckayi. Unfortunately no sutures can be 

 clearly made out in the present condition of the specimen, but, 

 as will be seen by the figure I give of the parietal region, the 



* fThe parentheses around the names of authors placed after scientific names in 

 this piiper are used in accordance with Article 23 of the International Kules of 

 Nomenclature (?roc. 7th l^it.Conp. Bostpn,1907, p. 44 (1912)).— Editok.] 



