XVlll 
PREFACE. 
rather smaller than the figured one. A large series of molars of this genus have 
also been obtained which seem to indicate the existence of other Siwalik species. 
ViSHNUTHEmuM.— Two associated upper molars of a sivatheroid from the 
Siwaliks of the Punjab, present characters which distinguish them from the molars 
of Slvatherium, Bramatherium, and HydaspitJierkmi ; from the size, and certain 
details of the form of these teeth, I have thought it not impossible that they may 
belong to Vishnutherimn iravadicum, of which the lower molars are figm?ed in 
Plate VII, figs. 1 and 2. 
Hydaspitheritjm megacephaltjm. — It is possible that some critic may say 
that the sj)ecific name of tins species is a barbarism, and, therefore, should be 
replaced. The name megaceplialum is undoubtedly a barbarism, hut the termi- 
nation appears to have gained general acceptation as a convenient adjectival form 
for scientific names. The Greek substantive Ke<^aX7] if translated into Latin, 
should probably he Cepliala, and the only direct adjectival form is Ke<^aXctJT 09 ; 
by naturalists, however, a latinised adjectival termination, Cep]ialus,-a~mi, is in 
common use ; e. g., Plesiosaurus hrachycephalus, Halcyon leueocephala, Btycliozoon 
liomaloceplialum. The term megaceplialum is used for brevity in place of megaloce- 
plialum, on the precedent of Megatherium for Megalotherium. 
Helladotherium. — M. Gaudry^ states that Helladotlierium occurs in India. I 
am not aware on what grounds this statement rests. 
These additional specimens will aflbrd ample material for another memoir, 
illustrative of Siwalik ruminants and their allies. 
Tetraconojdon magnum. — Since publishing (p. 79) the description of the imper- 
fect mandible figured on Plate X, I have discovered the two last molars belonging to 
that specimen, which had previously been mixed up with soma other specimens. 
As the execution of Plate X was very poor, I take the opportunity of re-issuing that 
plate with one of the newly found teeth in its proper serial position. To the 
measurements of the molars of the figured specimen given on page 80 must he 
appended, “length of last molar 1-95 inches, width of ditto 1‘3 inches.” This tooth 
shows that Falconer’s specimen belonged to the upper jaw. 
Conclusion. — The above additions and corrections will, I hope, render the con- 
tents of this volume correct, as far as my present knowledge goes. European palieon- 
tologists will, I hope, pardon many shortcomings and redeterminations in my work 
which have been in many cases almost unavoidable. The work of a student in ver- 
tebrate palaeontology in India is one of peculiar ditficulty in many ways. He has first 
of all the difficulty, common to workers in other countries, of having very frequently 
exceedingly imperfect and scanty remains from which to determine the affinities of 
an animal, and is consequently liable to false inferences from this som*ce. Secondly ^ 
he feels the want of a large collection of the remains of described European species 
of vertebrates for comparison : it is true the Indian Museum in Calcutta possesses a 
' “ Les Encbainements du Monde Animal, Mammiferes Tertiaries,” p. 79. 
