FEOM THE FOREST BED OP EAST RUNTON, 175 



1867. Lartet, E. Comptes Kendiis, vol. 64, p. 48. 



1857-69. Gervais, Paul. Zool. Pal. Gen. p. 80. 



1869. Owen, R. On the Distinction between Castor and Trogontherium. Geol. Mag. vol. vi. p. 49. 



1876. Alston, E. R. On tlie Classification of the order Glires. Proc. Zool. Soc. 1876, p. 78. 



1882. Newton, E. T. Vertebrata of the Forest Bed, p. 65. Mem. Geol. Surv. United Kingdom. 



1890. . On some New Mammals from the Red and Norwich Crags. Quart. Journ. Geol. 



Soc. vol. xlvi, p. 447. 



1891. . Vertebrata of the Pliocene Deposits of Britain. Mem. Geol. Surv. United Kingdom. 



9. EXPLANATION OF THE PLATE. 

 Trogontherium cuvieri, Fischer. All figures natural size. 



ho., basioccipital. 



eo., exoccipital. 



exa., external auditory meatus. 



fr., frontal. 



in., incisor alveolus. 



ip., interparietal. 



m. /, 2, 3, molar teeth. 



mt., mastoid portion of periotic, 



Tnx., maxilla. 



oc, occipital condyle. 



or., orbit. 



pa., parietal, 



pi., palatine. 



plf; palatine foramen. 



pm. -i-, premolar 4. 



pimx., premaxilla. 



so., supraoccipital. 



sof., suborbital foramen. 



sq., squamosal. 



th., tympanic bulla. 



Fig. 1. Skull from the Forest Bed of East Runton, near Cromer, in the possession of 



Mr. A. Savin, seen from above. 

 Fig. 2. Same specimen, palatal view. 

 Fig. 3. „ „ left side. 



Fig. 4. „ „ seen from behind ; the dotted line indicates the probable extent 



of the occipital crest. 

 Fig. 5. Right cheek-teeth of same specimen, grinding-surfaces slightly restored to show 



the enamel folds. 

 Fig. 6. Grinding-surface of three molars in the right maxilla described by Sir R. Owen 



in 1869, and now in the King Collection, Museum of Practical Geology. 

 Fig. 7. Grinding-surface of the right cheek-teeth of Fischer's type skull from the Sea 



of Azof, preserved in the Museum at Moscow. Copied from Rouillier's 



figure, and reduced to natural size. 

 Fig. 8. Grinding-surface of the right molars of the type skull of Conodontes loisvillettii, 



from the Pliocene of Saint-Prest, preserved in the Ecole des Mines, Paris. 



Drawn from wax impressions of the teeth kindly supplied by Prof. Daubree. 



