146 SAUEOPTERYGIA. 



Clay near Peterborough, and is in the Collection of A. K". 

 Leeds, Esq. On the concave side of the crown there are 

 very few ridges. The height of the crown, is 0,100 

 (3*9 inches), and the greatest transverse diameter 0,063 

 (2*1 inches). Made in the Museum, 1888. 



39787. The imperfect crown of a tooth very similar to No. R. 1279 ; 

 from the Oxford Clay of Weymouth, Dorsetshire. The 

 summit of the crown is wanting, but a distinct intercarinal 



Fig. 45. 



Pliosaurus ferox. — Part of the lateral surface of the crown of a tooth ; 

 from the Oxford Clay of Weymouth, j. 



space can be seen on the concave surface. The ridges on 

 the lateral (fig. 45) and concave surfaces are placed further 

 apart than in the preceding specimen. This example also 

 accords with the teeth figured by KiprijanofF. Purchased. 



32648. A small posterior tooth ; from the Oxford Clay of Vaches- 

 Noires (Calvados), France. In this specimen the ridges 

 continue quite round the crown. It is indistinguishable 

 from the two teeth figured by Kiprijanof, op. cit. pi. xiii. 

 fig. 1. Tesson Collection. Purchased, 1857. 



24683. The crown of a smaller tooth of similar type ; from the 

 Oxford Clay of Christian Malford, Wiltshire. 



Purchased, 1850. 



46008. The imperfect crown of a very large tooth ; probably from 

 the Oxford Clay of Dorsetshire. The diameter of the 

 fractured basal extremity is 0,051, and there is no trace 

 of an intercarinal space. Purchased, 1876. 



47429. The centrum of a somewhat crushed late cervical vertebra, 

 probably belonging to this species ; from the Oxford Clay 

 of Whittlesea, near Peterborough. Length 0,038 (1*5 

 inches), height 0,085 (3-35 inches), width 0,110 (4*35 

 inches). The costal facets are still divided, but the upper 

 one is connected by a ridge with the facet for the arch. 

 In the rough nature of the free surface this specimen 



