1870. ] LANKESTER—NEWER TERTIARIUS OF SUFFOLK. 509 
Mastodon is likely to be is the Miocene M. tapiroides (M. turacensis, 
Pom.), which also belongs to the Trilophodont section, and has 
simple valleys. The molars of M. tapiroides have a very marked 
cingulum, and are broader than those of M. Borsoni; whilst the 
ridges are not so high relatively as in that species. A small oblique 
plication running vertically on the sides of the transverse ridges is, 
however, considered by M. Lartet (Bull. Soc. Géol. France, 1859) its 
most distinguishing feature. Now, Mr. Baker’s molar (Pl. XXXIV. 
figs. 1 & 2) has shorter ridges than M. Borsoni, is wider than speci- 
mens of the corresponding tooth of MW. Borsont which I examined in 
Paris and in Le Puy, and has a considerable development of cingulum, 
which, though not nearly so large as that of M. tapiroides is yet larger 
than any presented by MW. Borsont. At the same time, Mr. Baker’s 
specimen, and all the fragments except that drawn in fig. 4, have no 
trace of the oblique vertical fold characteristic of MW. tapiroides. A 
decided indication of this fold is, however, present in Mr. Canham’s 
fragment drawn in fig. 4 (¢7), and it is a question how far this is 
decisive of a specific relation to M. tapiroides. We have not at 
present the material for deciding the question, though this parti- 
cular fragment (fig. 4) is referable to that species. M. Lartet, how- 
ever, informs me that he has seen from other localities evidence of a 
form intermediate between MM. tapiroides and M. Borsoni, and the 
specimens from the base of the Crag may belong to such a form. The 
posterior talon seen in figs. 1 and 2 is also preserved in the two 
specimens in the British Museum, and has a very constant form. 
All the specimens of this Trilophodont form, excepting Mr. Baker’s, 
are mere fragments, and most are much water-worn, which is 
significant of their history, and contrasts strongly with the condition 
in which the teeth of Mastodon arvernensis occur; so much so that 
one is not disposed to regard the two species as certainly contem- 
porary. The fragments and water-worn bits of Rhinoceros-teeth 
may be more consistently associated with this new Mastodon; and 
on the whole it seems probable that we must assimilate this new 
Trilophodon to the Miocene rather than the Pliocene species. 
J am aware that Mr. C. B. Rose some years since obtained a frag- 
ment of a Mastodon-tooth from gravel-beds, which he considered to 
be M. Borsoni; but the specimen and its history appear to be too 
imperfect to throw any light on the Trilophodont species from the 
Suffolk bone-bed, one specimen of which, be it remembered, is of 
pre-Diestien age. 
VY. List or Sprcizs or TrrRESTRIAL MAMMALIA FROM THE SUFFOLK 
BoNE-BED, WITH REFERENCE TO THE NUMBER OF SPECIMENS AND 
THE CoLLECTIONS CONTAINING THEM. 
There is, and has been for some years, in that district of Suffolk 
where the so-called “‘ coprolites” are dug, a remarkable eagerness to 
obtain and preserve the teeth of Mastodon and other mammals found 
in the bed. Very high prices are given for these teeth (in some 
cases several pounds), and accordingly many of the most interesting 
