412 MR. TOMES ON THE STRUCTURE OF THE TEETH OF MARSUPIAL ANIMALS. 
PLATE XXXVI. 
Fig. 7- A longitudinal section from the crown of a molar tooth of Petaurus tagua- 
noides, showing A, a portion of the dentine with its almost branchless 
dental tubes, and B, the enamel in whole thickness. 
Fig. 8. A longitudinal section from the tooth of Dasyurus ursinus, showing a portion 
of the dentine A, and the whole thickness of the enamel B, with the tubes of 
each. 
Fig. 9. A similar section of the tooth of Dasyurus macrourus. 
Fig. 10. A longitudinal section of the last molar from the lower jaw of Thylacinus 
cynoceyhalus, showing A, a portion of the dentine, and B, a portion, but 
not the whole thickness of the enamel. 
Fig. 1 1 . A section from the canine tooth of the Leopard, showing A, the peripheral 
part of the dentine, and B, the enamel. The latter is typical of the enamel 
of the ordinary carnivora, the fibres of which measure the so^oo th of an 
inch in diameter*. 
Fig. 12. A longitudinal section of a molar tooth of Didelphis virginiana, showing A, 
the dentine at its termination, and B, the enamel in its whole thickness, 
with the tubules in each texture. 
* This figure is introduced to show the diflferences between the enamel in the ordinary carnivora and in the 
marsupial carnivora. 
