PHYSETERID^. 57 



44044. An imperfect tooth ; from Woodbridge. Purchased, 1873. 



27518. The greater part of a rolled tooth ; from Felixstowe. 



PurcTiased, 1852. 



27435. A rolled tooth ; from Felixstowe. Purchased, 1851 . 



Genus PHYSETODON, M'Coy ^ 



The teeth of this genus are described as being very similar to 

 those of Physeter, but distinguished by the small size of the aperture 

 of the pulp-cavity at the base of the root ; in this respect they 

 resemble the teeth oiEucetus, and further observations are required 

 to prove their generic distinction. 



Physetodon baileyi, M'Coy-. 



This is the type and only species. 

 Hah. Australia. 



43996. The imperfect upper half of a tooth ; from the Lower Plio- 

 cene of Mordialloc, Hobsou's Bay, Victoria. This specimen 

 agrees very closely with the type teeth figured by M'Coy, 

 op. cit. pi. Iv. Purchased, 1872. 



Genus SCALDICETUS, Du Bus ^ 



The teeth are somewhat smaller than those of Physeter macro- 

 ce^hcdus, and are distinguished by a coat of grooved enamel on the 

 summit of the crown. The section of the tooth is subcircular ; the 

 cement is abundant and much thicker in the middle than at the, 

 two extremities, thus causing the tooth to be fusiform ; the dentine 

 core is subcylindrical throughout the greater part of the tooth; and 

 the central axis of dentine very slender, darker in colour than the 

 overlying layer, and without a nodular structure. In young 

 specimens the pulp-cavity is open and conical in shape. 



^ Paleontology of Victoria (Geol. Survey of Victoria), dec. vi, p. 19 (1879). 



^ Loc. cit. 



3 Bull. Ac. E. Belg. ser. 2, vol. xxiv. p. 508(1867). 



