INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
presence of a small fourth anterior digit in (at least some of) tlie European Aceratheria 
need not, in the writer’s opinion, he reckoned as a character worthy of generic 
distinction. In the Indian A. perimense the feet are unknown, and it is, therefore, 
impossible to say whether it may not have belonged to one of the American so-called 
genera. 1 
The statement on page 9, note 2, that the post-tympanic and post-glenoid 
processes of the squamosal of Aceratherium appear to be united interiorly has been 
found to be incorrect. 2 
It is stated by Prof. Cope 3 that “it is possible that a species of Aphelops still 
exists, in some of the Indian islands in tlie Rhinoceros inermis , Less.” The present 
writer, from having seen in Calcutta specimens of the Javan rhinoceros with a very 
minute horn, is strongly inclined to think that the so-called R. inermis is the same as 
that species. The existence of that form, together with some of the miocene 
European species, probably indicates that there is really no distinction between 
Aceratherium (in the sense in which it is used here) and Rhinoceros ; although the 
retention of the former is convenient. 
A separate genus, Diceratherium, Marsh, has been formed for the reception of 
Aceratherium pacificum (Leidy), and Rhinoceros oregonensis, Marsh, and is said to 
include 4 the European Rhinoceros pleuroceros, Duvernoy, which in the present volume, 
after Kaup 5 and Brandt, has been included with Aceratherium minutum ; although 
regarded by others as distinct. 6 
Rhinoceros mercld. — In the list on pages 5-6 Rhinoceros mercld , Jager, is given as 
a synonym both of R. etruscus , Falc., and R. leptorhinus, Owen. In the former 
instance it should have been /?. mercld , Meyer, which is not the same as Jager’s species. 7 
Additional species of Aceratherium. — -To the list of species of Aceratherium given 
on page 4 add — 
17. Aceratherium velaunum 8 (Aymard). Low. miocene, Europe. 
Rhinoceros cuvieri (?), Aymard. Rhinoceros velaunus, Aymard. 
Ronzotherium velaunum, Aymard. 
Names of the existing Asiatic rhinoceroses. — It is well to mention that, on the 
grounds of priority, the proper names of the three well-determined species of Asiatic 
rhinoceroses are undoubtedly R. sondaicus , R. sumatrensis , and R. unicornis : the names 
R. javanicus, R. sumatrensis , and /.’. indicus are, however, so convenient, as being 
exactly equivalent to the terms, Javan, Sumatran, and Indian rhinoceroses, that the 
first and third have been adopted in place of R. sondaicus and R. unicornis. 
1 The present •writer has been sharply pulled up by Messrs. Scott and Osborn (“ Contributions from the E. M. 
Museum of Geology and Archaeology of Princeton College ” — Bui. Ho. 3, p. 21, Princeton, U.S.A.) for including Aphelops 
with Aceratherium. The writer maintains that it was his only course, as the distinctions between the two (apart from the 
views mentioned above) are not of general applicability. 
2 Scott and Osborn, loc. cit. 3 “ Amer. Hat.,” Dec., 1879, p. 771b. 4 Ibid, p. 771h. 
5 Kaup, “ Beitrage,” pt. I. p. 3. 
6 See Gaudry, “ Les Enchainements du Monde Animal, etc. — Mammiferes Tertiaires,” pp. 76-6. 
7 See Forsyth -Major, “ Supra alcuni Rhinoceronti fossili in Italia.” ‘ Boll. R. Com. geol. Ital.,’ 1874, p. 94. 
8 Filhol, “Etude des Mammiferes Fossiles du Ronzon.” “ Ann. Sci. Geol.” vol. XII., art. 3 (reprint), p. 76, 1881. 
