A TUSK OF A PROBOSCIDIAN MAMMAL. 
781 
Description oe the Plate. 
PLATE 51. 
Notelephas australis. 
Fig. 1. Side view of tlie basal part of the tusk. 
Fig. 2. Ib. of the opposite side of ditto. 
Fig. 3. Transversely fractured surface of the basal end of ditto. 
Fig. 4. Ib. of the opposite end of ditto. 
Fig. 5. Side view of the succeeding portion of the tusk. 
Fig, 6. Transversely fractured end view of ditto. 
Fig. 7. Side view of a terminal portion of the tusk. 
Fig. 8. Transversely fractured surface of the basal end of ditto. 
Fig. 9. Longitudinal section of dentine, magnified 50 diameters. 
Fig. 10. Ib. ib., magnified 8 diameters. 
Fig. 11. Transverse section of cement, magnified 90 diameters. 
Figs. 1-8 are of the natural size. 
