232 SUPPLEMENT. 



there are no serrations on the carinae. The mandible has a distinct 

 terminal expansion, with a long interval between the 4th and 5th 

 tooth. 



[In fig. 14, Pt. I., la = prefrontal.] 



Metriorhynchus superciliosum 1 {supra, i. p. 96). 



Syn. ? Metriorhynchus blainvillei, Deslongchamps 2 . 

 = Teleosaurus blainvillei, Deslongchamps 3 . 

 Steneosaurus dasycephalus, Seeley 4 . 



In the type cranium 5 the prefrontals have only a very short 

 sutural junction with the frontals and a straight inner border ; 

 whereas in the type of M. blainvillei*, of the Kelloway rock, the 

 prefrontals have a long sutural junction with the frontals and a 

 convex inner border. The large series of skulls in the collection of 

 Mr. A. N. Leeds shows, however, such a great variation in these 

 respects that they cannot be regarded as of specific value. 



Hab. Europe (France and England). 



The following specimens were obtained from the Oxford Clay near 

 Peterborough, and, unless the contrary is staled, were presented 

 by A. N. Leeds, Esq., 1889. 



R. 1665. Cast of the frontal region of the cranium. The original, 

 which is a portion of the type of (Steneosaurus dasycepha- 

 lus, is preserved in the Woodwardian Museum, Cambridge ; 

 it indicates a comparatively large individual. The con- 

 tour of the prefrontals is somewhat intermediate between 

 that ootaining in the type of the present species and that 

 of the so-called M. blainvillei. 



Made in the Museum, 1889. 



R. 1666. The nearly entire skull of a smaller individual. The 

 contour of the prefrontals is almost exactly the same as 

 in the type cranium. 



R. 1530. The imperfect skull of an individual agreeing in size with 

 the preceding. The posterior half of the right prefrontal 

 is entire, and has the short sutural junction with the 



1 Amended from superciliosus. 



2 Notes Paleontologiques, p. 295 (1869). 



3 Bull. Soe. Linn. Norm. ser. 2, vol. i. p. 146 (1867). 



4 Index to Aves etc. in Cambridge Museum, p. 140 (1869). — No description. 



5 Notes Paleontologiques, pi. xx. fig 2. 6 Ibid. pi. xx. fig. 1. 



