438 J. T. WILSON AND J. P. HILL. 
found in wombat may ultimately be found characteristic also 
of some other diprotodont Marsupials. 
It will be noted that if the view for which Rose indicates 
his preference be correct, the acceptance of it implies at least 
a partial surrender of what we may call the Kiikenthal-Rose 
position in relation to the marsupial dentition generally. 
In his recent work (8, pp. 100, 101), Leche has definitely 
adopted that interpretation of Rése’s observations which Rose 
himself somewhat reluctantly put aside, and has thus attempted 
to conserve in its integrity the ruling modern theory of the 
marsupial dentition as a true ‘ milk ”’ series. 
The solution which Leche confidently advocates involves the 
interpretation of the prematurely calcified teeth of wombat, 
not as homologues of milk-teeth, but as vestigial remains 
of a “prelacteal” series inherited from the polyphyodont 
ancestors of the Mammalia. 
It will appear in the sequel that the present writers are 
very strongly inclined to adhere to that interpretation of these 
rudimentary teeth which Rose decides to accept in the paper 
under consideration. But in so doing it will appear that they 
also advocate a much wider extension of the hypothesis in- 
volved in that interpretation than was contemplated by Rose. 
In the ‘ Proc. Zool. Soc.,’ May 2nd, 1893, there appeared a 
paper by Mr. M. F. Woodward (2) on ‘“ The Development of 
the Teeth of the Macropodide,” in which the author gave 
an account of his discovery in certain members of that family 
of a number of small calcified teeth supplementary to the 
proper rudiments of the adult dentition. 
Thus in the upper jaw of Petrogale he found, in addition 
to the germs of the three adult incisors, three “ minute 
calcified rudimentary (or rather vestigial)” teeth. So, again, 
in the case of the lower jaw he found two vestigial teeth 
in addition to the enamel-germ of the permanent lower 
incisor. From his facts Mr. Woodward draws certain 
conclusions regarding the relations of the dentition of 
Macropods to that of Polyprotodonts and primitive Mar- 
supials, with which we are not here concerned. It is to be 
