PLESJOSAURIDJE. 147 



agrees with the cervicals in the Cambridge Museum to 

 which the name P. pachydirus has been applied. 



Purchased, 1876. 



The following form may be identical with one of the preceding. 

 Pliosaurus (Polyptychodon) archiaci, Deslongchamps x ; Kime- 

 ridgian, Boulogne. 



Specifically undetermined specimens. 

 R. 38. The imperfect anterior extremity of a cranium ; from the 

 Kimeridge Clay of Osmington, near Weymouth, Dorset- 

 shire. This specimen shows the broken bases of both the 

 large and small teeth, and also the summit of the crown 

 of a germ-tooth. It very probably belongs to P. brachy- 

 dirus. Purchased, 1880 



39225. Fragment of a mandible; from the Kimeridge Clay of 

 Stukeley, Hampshire. This specimen comprises part of 

 both rami immediately behind the symphysis ; the right 

 one showing nine alveoli. Purchased, 1865. 



R. 484. The centrum of a dorsal vertebra ; from the Jurassic of 

 Higham-Eerrers, Northamptonshire. In contour this spe- 

 cimen resembles the dorsals of P. macromerus, but its 

 dimensions are smaller than those of adult examples. 



Presented by T. I. Starling, Esq. 



41862. The proximal portion of a large rib; from the Kimeridge 

 Clay of Weymouth. Purchased, 1869. 



R. 736. Part of a rib ; from the Kimeridge Clay of Kimeridge Bay, 

 Dorsetshire. 



Presented by J. C. Mansel-Pleydell, Esq., 1886. 



Generically Undetermined Specimens. 



Of the following limb-bones some may belong to Pliosaurus and 

 others to Cimoliosaurus. 



R. 1306. Cast of a small right femur. The original was obtained 

 from the Kimeridge Clay of Shotover, near Oxford, 

 and was formerly in the Collection of the Earl of Ennis- 

 killen. The cast is figured by Phillips in his ' Geology of 

 Oxford,' p. 363, as Pliosaurus grandis. The dimensions 

 are : — length 0,314 (12*4 inches), width at distal extremity 



1 In Lennier's ' Etudes geologiques ct paluontologiques sur 1' Embrasure do la 

 Seine,' p. 30 (1870). 



l2 



