790 The American Naturalist. [September, 
Procolophonina. In my paper on the postorbital bars of Reptilia (Trans. 
Amer. Philos. Soc., 1892, p. 16, bottom) I refer to the postorbital bar of 
the Theriodonta, meaning the Pelycosauria. This is due to the premature : 
assumption by English authors, to which I at the moment assented, that 
the two groups are identical.—E. D. COPE. 
Scott on the Mammalia of the Deep River Beds.'—In this 
handsome memoir of 130 pages we have recorded the results of the 
Princeton College expedition of 1891. The region explored is the val- 
ley of Deep River, one *of the upper tributaries of the Missouri in 
Montana. This formation was observed to contain fossils by Grinnell 
and Dana in 1875, and was explored by a party sent by the present 
reviewer in 1878. The latter reported from it twelve species of Mam- 
malia all of which were new except a Prothippus of Loup Fork age, 
and a Protolabis of uncertain species. The Princeton expedition ob- 
tained twenty-two species, of which eight are new to science. Prof. 
Scott prefers to call this formation by the name of Deep River, rather 
than the Ticholeptus bed, as it was originally named by Cope. This 
is because the name Ticholeptus, as a paleontological term, is a syno- 
nym of Merychyus. However, as applied’ to a formation, it was not 
preoccupied, and it is doubtful whether, under the rules, it can be 
changed. 
The new forms belong to the following orders : Carnivora, 2 ; Glires, 
1; Perissodactyla, 2. Artiodactyla, 3. The most important addition 
to the Carnivora is a new genus of Canidz, Desmatocyon, which agrees 
with Canis, except in the possession of three longitudinal convolutions 
of the cerebral hemispheres. The Glires are represented by a new 
Steneofiber. The most important novelties are two species of three- 
toed horses, which are named respectively Desmatippus erenidens and 
Anchitherium equinum, the latter the largest known American species 
of its genus. Prof. Scott takes occasion to present a new classification of 
the genera of American three-toed horses, distinguishing four genera 
in species formerly referred to Anchitherium. These are Mesohippus, 
Miohippus, Desmatippus (nov.) and Anchitherium. Scott has already 
shown that Mesohippus differs from the other genera in the absence of 
pits of the ineisors, and he assumes that Miohippus, named but not 
distinguished by Marsh, possesses those pits, although he states that its 
upper incisors are not known. I can state that this supposition is per- 
fectly correct, as they are present in the species I have called Anchi- 
‘From the Transactions of the American Philosophicel Society, 1894, Vol. 
X VII, p. 55. 
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