70 Vertebrate Palaeontology of Cambridgeshire 



obtained from the same formation in Huntingdonshire. Pro- 

 bably, however, this is to a great extent due to the circum- 

 stance that they have not been collected in the same careful 

 manner as in the latter county. Of pliosaurs the Oxfordian 

 Pliosaurus ferox, distinguished from Kimeridgian species by 

 its inferior size and the almost complete absence of facetting 

 on the teeth, which are fluted all round, is not improbably 

 represented by certain vertebrae in the Sedgwick Museum 

 from Great Gransden, for which the name Pliosaurus pachy- 

 dirus has been suggested by Professor Seeley 1 . Remains of 

 the species are also stated to occur in the Oxford Clay of 

 Whittlesea. Of the slender-jawed pliosaurs the above- 

 mentioned Peloneustes philarchus is represented by the im- 

 perfect skeleton of a hind-limb from Whittlesea, preserved 

 in the collection of the British Museum 2 . Among the plesio- 

 saurs, remains of Muraenosaurus plicatus and M. richardsoni 

 are recorded from Whittlesea in the British Museum Cata- 

 logue of Fossil Reptiles, where those species are included in 

 the Cretaceous genus Cimoliosaurus. In the same work 

 reference is made to the occurrence of bones of an ichthyo- 

 saur {Ichthyosaurus thyreospondylus) in the clay pits at 

 Whittlesea. 



The most interesting specimen from the Oxford Clay of 

 the county is, however, the femur of a small dinosaur, for 

 which the name Cryptosaurus eumerus was at first suggested 

 by Professor Seeley. On account of previous use in another 

 sense, the generic title was subsequently changed by the 

 present writer 3 to Cryptodraco. The specimen, which is 

 preserved in the Sedgwick Museum, to which collection it 

 was presented in company with a number of other vertebrate 

 fossils, by Mr L. Ewbank, of Clare College, is 12 J inches 

 in length, and indicates a small member of the iguanodon 

 group. 



1 " Index to Ornithosauria, etc." 18. 



2 Cat. Foss. Eept. Brit. Max. n. 158. 



3 Quart. Journ. Geol. Soc. XLV. 40 (1889). 



