DEVELOPMENT AND SUCOESSION OF TEETH IN PERAMELES. 581 
ADDENDUM. 
Reference has been made in a foot-note in the body of this 
paper to a contribution by Dr. Marett Tims (87) of ‘‘ Notes on 
the Dentition of the Dog,” published in February in the 
‘ Anatomischer Anzeiger.’ Since our research was completed 
and the bulk of our work written up before Dr. Tims’ paper 
came into our hands, we have found it easier to leave its con- 
sideration for this special note. 
From his observations upon tooth-development in the dog, 
Tims has arrived at certain conclusions with regard to the 
mammalian dentition with which our work will be found in 
general agreement. And although this writer has apparently 
not carried on special researches on the teeth of Marsupials, 
his own work upon the dog has led him to foreshadow in some 
degree the views independently arrived at by the present 
writers on the grounds of a somewhat extensive and prolonged 
series of observations. 
Dr. Tims’ further confirmation of the common occurrence of 
a residual dental lamina beside the permanent teeth of 
Eutheria is a very welcome one. 
The conclusion from his paper with which we are most parti- 
cularly concerned is the following :—‘“‘ That there is not suffi- 
cient evidence for believing in the existence of a pre-milk 
dentition even in a rudimentary condition in the Mammalia 
of the present day.” And a corollary, drawn in part from 
this proposition, is that if Tims’ view be accepted, “ the teeth 
of Marsupials would once more appear to belong to the per- 
manent series.” 
