252 The American Naturalist. [Mareh, 
C. simus, which Mr. Earle refers to the C. elephantopus, but of which 
the second and third do not exhibit the form of the last superior molar 
which he regards with me as characteristic of the latter species. It is 
not unlikely that C. simus and C. molestus are one and the same, but 
the evidence is not yet in favor of their being identical with the C. 
marginatus. It is probable that these specimens represent at least one 
distinct species of rather small size. ; 
In conclusion [ think that Mr. Earle has been hasty in his whole- 
sale reductions, and that instead of ten species in the American 
Wasatch beds there are at least fifteen recognizably described. It is 
evident that more material and more research are necessary before a 
larger number than this can be demonstrated and before those which 
are admitted can be fully defined. A considerable part of Mr. Earle’s 
conclusions may be due to the fact that, as he says, he has “ labored 
under the disadvantage of not being able to study any of the types of 
Coryphodon from New Mexico which have been described by Professor 
The Coryphodontidse were the predominant type of the Wasatch 
(Suessonian) Eocene, and they were probably numerous in species and 
varied in character. If the bones and teeth of the existing African 
antelopes were mixed up and discovered piecemeal, they would puzzle 
naturalists, who would at first be incredulous as to their representing 
over forty species.—E, D. Corr. 
