118 0. C. Marsh—Mammals of the order Dinocerata. 
atrox to an upper canine tooth, probably of the same animal, 
on the supposition that it pertained tea carnivore.* 
The remarkable feature in the skull of this group was first 
indicated in the name Z%noceras, proposed by the writer (Au- 
gust 19th, 1872) for the genus represented by the type species, 
and subsequently mentioned in this Journal. 
rof. Cope has since proposed the generic name FHobasileus,t 
and indicated three species, which apparently are not distinc 
from those previously described by Dr. Leidy and the writer. 
Many of the characters given by Prof. Cope in his description 
of these animals do not indeed apply to the other known species, 
but it is evident he has made several serious mistakes in his 
observations. Among the more important of these errors are 
the following:—What Prof Cope has called the incisors are 
canines, and hence his statement that there are large incisor 
tusks, but no canines, should be reversed. 2d. The stout horns 
and it has over it a prominent ridge on the frontal. 4th. Ihe 
occiput is not vertical, but extends obliquely backward, the 
occipital crest projecting behind the condyles. 5th. The tem- 
* Proceedings Philadelphia Academy, 1872, p. 169. 
Vol. iv, September, 1872, Erratum ; also October, 1872, p. 332. _ on 
It is uncertain date should be assigned to the name Zobasileus, and : 
f 
when copies were first received by the Philadelphia Academy of Nat. Science, of 
which Prof. © : tes on (Aug. 20th and 22 
1872) certainly do not represent those of tion. The descriptions 
have not yet appeared in the Pr ings of the American Philosophical Society, 
oceedings Cc) 
where they were read (Sept. 20th, 1872), and hence no exact reference to them can 
i ther pa by Prof. Cope on fossil vertebra 
om Wyoming bear various dates from July 11th to October 12th, 1872, bu 
apparently none of them were published before October 29th, and some of them 
certainly not until about a m r. : 
This Journal, vol. iv, pp. 322, 323, 343, Oct. 1872. Also Proc. Am. Philosoph- 
ical Soc., vol. xii., Dec., 1872, and Am. Naturalist, vol. vii, p. 52, Jan., 1872. 
