INTRODUCTORY OBSERVATIONS. xxiii. 
Mamm. Brit. Mas.” pt. II. p. 244). The fragment of a maxilla with two molars of 
an Anthracotherium from Piedmont in the British Museum noticed in vol. II. pp. 151, 
153 as A. cuvieri has been provisionally referred to A. alsaticum {vide ‘‘ Cat. Foss. 
Mamm. Brit. Mus.” pt. II. p. 240.— No. M. 75). 
Suidee. — In the list of species of Hyotherium given on pp. 92-94 of this volume, 
it appears probable that both H. meissneri and H. suillum are synonyms of H. typum ; 
' H. majus is probably equivalent to H. soemmeringi ; while the so-called Ghwromorus 
simplex is apparently entitled to rank as a distinct species, and may be known as 
H. simplex {vide “Cat. Foss. Mamm. Brit. Mus.” pt. II. pp. 254, 257, 258). The 
species mentioned on page 52 of this volume (on the authority of Prof. Gaudry) 
under the name of Bus steinheimensis apparently belongs to Hyotherium. Bus 
choeroides {infra, p. 51) is a middle miocene form. 
Since the second part of this volume was published a new existing species of 
Bus from Borneo has been described by Dr. A. Nehring^ as B. longirostris, who 
regards it as allied to 8. verrucosus. In the same paper that writer does not accept 
Prof. Forsyth-Major’s limitation in the number of the existing species {vide infra, p. 
50). The pliocene north African form noticed on page 77 has been referred by M. 
P. Thomas^ to another new species under the name of B. phacochoeroides. Species 
of Cynocephalus, Hipparion, Equus, etc., are recorded from tlie same region. 
Hippopotamidse.— The specimens in the British Museum indicate that Hippopo- 
tamus pentlandi {infra, p. 37) is decidedly smaller than the existing race of H. 
amphibius, and also show differences in the form of some of the limb-bones {vide 
“ Cat. Foss. Mamm. Brit. Mus.” pt. II. p. 287). 
Equidse. — In the list given in vol. II. pp. 71, 72 Equus devillei., E. micrognathus, 
and E. piscenensis are American forms distinct from E. caballus. E. arcidens, Owen, 
appears indistinguishable from E. principalis, Lund, {vide “ Cat. Foss. Mamm. Brit. 
Mus.” part III.®). - <- 
Rhinocerotidse. — As mentioned above, the writer now proposes to include Acera- 
therium in Rhinoceros. In the list of species'^ given in vol. II. pp. 3-7 Rhinoeeros 
cimogorrhensis is equivalent to /?. simorrensis (the former name having the priority) ; 
R. mercld and R. Idrkbergensis, Jager, are synonyms of R. megarhinus, Christol, and 
not of R. leptorhinus, Owen ; while R. lunelensis, Glervais, is probably equivalent 
to the latter, instead of the former. Apparently all the specimens on which R. 
sinensis was founded belong to R. sivalensis. The formula of the cutting-teeth of 
the so-called Peracems {vide vol. II. p. ix.®) according to a later memoir of Prof. 
Cope® is I ^ C J (or I ^ C ?) instead of I ^ C 
1 ‘ Zoologischen Anzeiger,” vol. VIII. pp. 347-353 (1885). 
2 ‘ Mem. Soc. Geol. France,’ ser. 3. vol. III. art. 2. (1884). 3 In preparation. 
4 The specimens from Quercy originally referred to JJ. minutus were subsequently shown by Filhol (Ann. Sci. Geol. ’ 
vol. XI. art. I; p. 4) to belong to R. croizeti. 
5 In. note 1 on that page the volume and date (XIV-1880) are inadvertently omitted. 
6 ‘Proc. Amer. Phil. Soc.’ 1881, p, 393. 
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