780 The American Naturalist. [September, 
are fully familiar with the literature of this subject. Let us now 
consider the four points which the author has advanced in reply 
to my review of his determinations of twenty-seven distinct types. 
1. First, as regards the types of the genus Stagodon and 
family Stagodontidz, the author still considers them as mam- 
malian teeth, and remarks: “I distinctly stated that this tooth 
has two fangs, and the bases of these were indicated in one of 
my figures.” As this point is an interesting one, I reproduce for 
a second time the figures of the teeth which were selected as the 

1.—(STAGODONTID&.) a, Stagodon nitor. AfterMarsh. Types. 4, Platacodon 
nanus, pre Marsh. Types. 
types of Stagodon, and allow the reader to judge. We must 
direct our attention only to these types, remembering that the 
other teeth were all found isolated, and the fact, as urged by the 
author, that “other teeth described as premolars,” and “ well- 
preserved specimens since obtained” show distinct fangs, has no 
bearing upon the question, since the association of these teeth 
with the types is purely conjectural. 
2. The order “Allotheria.” The author claims that he has 
defined it, that it is prior to Multituberculata, and should be 
adopted. There is no question as to the priority of definition 
of the Allotheria; let us consider the character and applicability 
of the definition. A fundamental objection to this term, as well 
as to Pantotheria, is that Gill and Huxley had previously em- 
ployed the termination ‘teria for the three great subclasses of 
Mammalia (represented to-day by the Monotremata, Marsupialia, 
and Placentalia); the termination had thus acquired a distinctive 
and useful subclass rank. Even, therefore, if All6theria had been 
properly defined, it could not well be adopted for a group which 
16] have found a number of ‘errors in my writings upon the Mesozoic mammals 
which are not in the author's list. I have also taken great care in every instance. to 
publish corrections of them as soon as discovered, 




