272 SUPPLEMENT. 



R. 1681. The crowns of three associated teeth ; from the Kimeridge 

 Clay of the Isle of Portland. One is of large size. 



Presented by G. Clifton, Esq., 1889. 



R. 1679. The head of an ischium ; from the Portland Oolite of the 

 Isle of Portland. Presented l>y G. Clifton, Esq., 1889. 



R. 1680. The distal portion of a propodial bone apparently refer- 

 able to this genus ; from the Portland Oolite of the Isle of 

 Portland. Presented by G. Clifton, Esq., 1889. 



Pliosaurus ferox {supra, ii. p. 145). 



If the undermentioned be rightly referred to this species, it will 

 be characterized by the absence of a central mammilla on the ter- 

 minal faces of the cervical vertebrae, and by their prominent costal 

 articulations ; and also by the form of the epipodial bones, which are 

 similar to those of Peloneustes, and thus more elongated than in the 

 Kimeridgian species of Pliosaurus. 



The originals of the following specimens, ivhich belong to one indi- 

 vidual, were obtained from the Oxford Clay near Peterborough, 

 and are preserved in the collection of A. iV. Leeds, Esq., of Eye- 

 bury, near that town. The casts were made in the Museum in 



1889. 



R. 1661. Cast of an anterior (? upper) tooth. The original is 

 figured by the writer in the ' Quart. Journ. Geol. Soc' 

 vol. xlvi. pi. v. fig. .1. The ridges on the crown are placed 

 more closely and the carinas less defined than in typical 

 examples. 



R. 1661 a. Cast of the centrum and ribs of a late cervical vertebra. 

 Original figured by the writer, op. cit. pi. v. fig. 2. The 

 terminal faces are subcylindrical ; the dimensions are, 

 length 0,045 (1'75 inches), height 0,092 (3-6 inches), 

 width 0,102 (4 inches). 



R. 1661 b. Cast of the centrum of a later cervical vertebra. The 

 original, which has been somewhat shortened by crushing, 

 is noticed by the writer, op. cit. p. 51. The terminal 

 faces are transversely ellipsoidal, and have a height of 

 0,095 (3-7 inches) and a width of 0,109 (4-3 inches). 

 This vertebra has a strong general resemblance to the 

 slightly smaller specimen, No. 47429 (supra, ii. p. 146), 



