. Cope papers, 1871-[1897. Zoology; Paleontology. 1879-] Extinct American Rhinoceroses and their Allies. 7717 Position.—The longest kaown species, the A. crassus, was found by Dr. Hayden on the Niobrara River, Nebraska. Teeth pre- senting the same characters have been found in Northern Kansas and Eastern Colorado. The other species are more restricted geographically. A considerable exploration in the Loup Fork beds of North-eastern Colorado, conducted by myself in 1873, yielded four individuals of A. megalodus, but no fragments refer- able to the other species. Explorations in Northern Kansas
. Cope papers, 1871-[1897. Zoology; Paleontology. 1879-] Extinct American Rhinoceroses and their Allies. 7717 Position.—The longest kaown species, the A. crassus, was found by Dr. Hayden on the Niobrara River, Nebraska. Teeth pre- senting the same characters have been found in Northern Kansas and Eastern Colorado. The other species are more restricted geographically. A considerable exploration in the Loup Fork beds of North-eastern Colorado, conducted by myself in 1873, yielded four individuals of A. megalodus, but no fragments refer- able to the other species. Explorations in Northern Kansas by Russell S. Hill, of Philadelphia, produced five individuals of A. fossiger and five of A. malacorhinus, but not a fragment of A. megalodus. History.—In my original definition of this genus, I relied on. Fig. 8.—A. malacorhinus skull, represented in Fig. 7 from above, one-sixth natural size. the number of premolars in distinguishing it from Rhinocerus as well as on the absence of the horn. These teeth are generally 3 in Aphelops, and are said to be | in Rhinocetus, in most works, on the subject. These numbers are not constant; on one side of both jaws in Aphelops from Colorado, I have observed a first pre- molar, and on one side of the upper jaw of ^. malacorhinus there are four premolars ; the other side is injured. In several species of Rhinocerus, three premolars only are usually found in the mandible. I may add that Lesson and Peters^ have described a Rhinocerus inerniis Less., which is found living on some of the islands at the mouth of the Ganges. The only known specimens are the skulls, with portions of the skin, of a female and young. These are hornless, and in general structure allied to the R. son- daicus, yet presenting some important differences.^ Should the characters of this form prove to be specific, and the male be found to lack the horn, it must be regarded as a species of Aphelops. ' Monatsberichte Berlin. Akademie, 1877, p. 68, pi. 1-2. ^ Peters repre
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