1847. | OWEN ON ENGLISH EOCENE MAMMALIA. 19 
locality and deposit three portions of the lower jaw of the same species 
of Paleotherium ; two of which formed part of the same ramus, the 
left, and contained three grinders together with the last characteristic 
three-lobed one (fig. 4, m 3), by which the Paleeothere differs from 
the Rhinoceros, Hyrax, Macrauchenia, and other Pachyderms with 
the lower grinders in two semicylindrical lobes. The other teeth in 
this fragment were the second (m 2) and first (m 1) true molars and 
the last premolar (p 4). The antero-posterior extent of the. series 
and of each individual tooth very nearly equalled those in the fig. 2. 
pl. 42. tom. cit., attributed by Cuvier to the Paleotherium medium ; 
_ In which figure, however, the teeth are somewhat smaller than those 
in the entire jaw, fig. 1. pl. 40. tom. cit., also attributed by Cuvier 
to the Pal. medium. 
Thus the antero-posterior extent of the series of three true molars 
in the Hordle Paleeothere (fig. 4) is 3 inches 1 line (7 centimeters 
11 millimeters), and in fig. 2. pl. 42. tom. cit. it is 3inches 3 lines (8 
centimeters 3 millimeters) ; whilst in fig. 1. pl. 40. tom. cit. the 
antero-posterior extent of the corresponding teeth is 3 mches 5 lines 
(8 centimeters 6 millimeters). The lobes of the molars of the Hordle 
specimen are also triangular, rather than semicylindrical : the outer 
convexity, instead of bemg smoothly rounded presenting a well- 
marked angle, notwithstanding they are worn nearer to the base than 
are the teeth attributed to Pal. medium in the Cuvierian figures above 
cited. 
The direct view of the grinding surface by which the difference of 
the Hordle molar teeth in the shape of their lobes could be best 
tested is not given by Cuvier in regard to the Paleotherium medium ; 
those of the Pal. crassum figured m pl. 39. fig. 2. most accurately 
coimeide with the semicylindrical form ascribed to the lobes of the 
lower molars of the Paleeothere in the text of the ‘ Ossemens Fossiles,’ 
and differ in a marked manner from the angular form of the same 
lobes in the Hordle Palzeothere, as well as by their smaller size. Of 
the accuracy of the Cuvierian figure we have the opportunity of jud- 
ging by the beautiful casts of the skull of the Palzotherium crassum in 
the British Museum and other collections in London. 
I am led, therefore, to suspect that the species of Palzeothere re- 
presented by the fragments of lower jaw and teeth from Hordle may 
be distinct from the Paleotherium medium represented by the lower 
jaw from Montmartre, figured in pl. 40, and referred to at p. 67 of 
the ‘Ossemens Fossiles,’ tom. ii. as a typical example of that species. 
The distinction of the Hordle specimen from the species represented 
by the portion of lower jaw (pl. 42. fig. 2) is more doubtful: this 
figure shows, as far as a side-view can, a more angular figure of the 
molars than in fig. 1. pl. 40. It shows also a smaller size of the 
molars, though these still slightly surpass those of the Hordle Pa- 
leothere. Fig. 2. pl. 42. shows a slight difference in the shape of 
the angle of the jaw as compared with fig. 1. pl. 40; it is how- 
ever referred to the Pal. medium in the description of the plates in 
the posthumous 8vo edition of the ‘ Ossemens Fossiles ;’ and it may 
have belonged to a female of that species. I purpose, therefore, to 
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