5)D6 Mr. E.R. Lankester on new Mammalia 
colour, partly owing, no doubt, to the natural stain which occurs 
in the incisors of most Rodentia. 
Delphinus (Phocena) uncidens, u. sp. 
Of the two little teeth represented in Pl. VIII. figs. 12,13, one 
is in my own collection, the other in that of Mr. Whincopp. 
When first I obtained these, I was led, by their peculiar curved 
form and great length of fang, to regard them as incisors of a 
species of Phoca, and this the more especially since a Seal had 
been discovered by the illustrious Van Beneden in the Antwerp 
Crag. <A careful comparison and examination of the teeth, 
however, has convinced me that they belong to a species of 
Delphinus hitherto undescribed. In those Seals which present 
incisors having this peculiar hook-like form the tooth is mvari~ 
ably lobed or developed to a small extent on one side; the fang, 
too, is considerably flattened, so that the antero-posterior breadth 
is greater than the lateral. In the two teeth from tne Crag this 
is not the case: the unciform crown is perfectly symmetrical, 
and the fang is flattened in the reverse direction. ‘The form of 
the teeth agrees very exactly with the conoid denticles of some 
Delphinide, more particularly of the subgenus Phocena. The 
enamel on the crown is thin, as in most Cetacea, whilst the en- 
larged fang is very characteristic of that group. I propose 
therefore to cal! this species Delphinus uncidens. With the teeth 
I would associate, under this specific name, certain small ceto- 
tolites, which have long been known as occurring in the Crag, 
more particularly in the neighbourhood of Woodbridge (whence 
also the teeth were originally obtained), but which have never 
been described. One of these auditory bones is represented in 
figs. 2, 3. Such examples are very numerous of this size, which 
would agree very well with the size of the small teeth. They 
are evidently the “ ear-cases” of small Delphinide, and pre- 
sent no striking characters which should distinguish the animal 
to which they belonged from the ordinary forms of Phocena and. 
Delphinus. It may be considered a very fortunate circumstance 
that the teeth and ear-bones can thus be united, and assigned 
to the same species in so certain a manner, since the discon- 
nected nature of the Cetacean remains of the Red Crag has in 
many instances prevented a correct appreciation of their specific 
and generic value. 
Delphinus (Phocena) orcoides, n. sp. 
The species to which I have ventured to give this name is repre- 
sented by three teeth in the collection of Mr. Whincopp, of which 
two are drawn in PI. VIII. figs. 14-18. At first sight, the tooth 
in figs. 14, 15, 16 might also be mistaken for the canine of one of 
