ON THE GENUS TINOCERAS AND ITS ALLIES. 
BY PROFESSOR O. C. MARSH. 
Ix the March Naruratist (p. 157) there is an article by Prof. 
Cope, on “ The Gigantic Mammals of the Genus Eobasileus,” 
which contains no new facts on the subject, but some interesting 
additions to the list of errors which I have pointed out in the same 
number (p. 151). This paper purports to have been read at the 
Dubuque Meeting of the American Association of Science, but ob- 
viously includes the results of Prof. Cope’s later investigations, as 
well as some corrections suggested by my recent criticism. This 
is equally true of the appended paper, which was first issued sepa- 
rately, and has just been republished, in an amended form, in the 
“ Proceedings of the Philadelphia Academy ” (p. 11) 
Since the March Narura.ist was published, I have had an op- 
portunity, through the kindness of Prof. Agassiz, of examining a 
series of photographs of the skull described as Eobasileus cornutus, 
by Prof. Cope. These views fully confirm my previous belief in 
regard to this specimen (p. 153), viz.: that it belongs to my genus 
Tinoceras, and hence to the Dinocerata. The species is apparently 
T. grandis Marsh. These photographs, moreover, when examined 
in connection with remains of Dinocerata in the Yale Museum, show 
conclusively that Prof. Cope has, from the first, mistaken many 
important characters of his own specimens, and hence his errone- 
ous conclusions in regard to the group to which they belong. His 
papers on this subject, therefore, should be corrected on the fol- 
lowing points, as well as on those I have already mentioned :—1st, 
The name Eobasileus Cope, is a synonym of Tinoceras Marsh, 
which antedates it (p. 152), and the name of the family, Tinoce- 
ratidæ, likewise has priority over Eobasiliide, which Prof. Cope has 
recently introduced. 2nd, The name Lozxolophodon Cope should 
not be applied to this genus, as there is no satisfactory evidence 
that the single premolar tooth to which it was first given is generi- 
cally identical, and the probabilities are against it. 3d, The spe- 
cies Eobasileus cornutus Cope appears to be the same as Tinoceras 
grandis Marsh, which was first described. The species E. furcatus 
Cope, founded on portions of supposed nasal bones To Prof. 
< ; 217) 
