36 PROCEEDINGS OF THE GEOLOGICAL SociETY. [June 16, 
it is plain that the violence inflicted upon the head of this young 
Pachyderm has been received before the skull became imbedded in 
the eocene mud, and that the matrix hardening around it has pre- 
served the evidence of the nature of the i injuries received to this day. 
The points of the great canine teeth of old crocodiles not unfrequently 
become so blunted as would produce such crushed and depressed 
fractures without penetrating more deeply. The remains of an extinct 
species of Crocodile are common in the same formation as that in 
which the debris of their prey have been buried. I have received 
many detached teeth and bones through the kindness of the Messrs. 
Falconer, and Lady Hastings has generously confided to me for de- 
scription the unique and almost perfect skull of a crocodile from the 
Hordle sands, which demonstrates, by the exterior position of the 
lower canines in the grooves on the outer border of the upper jaw, its 
true crocodilian character. The Sheppey crocodile also belongs to 
the subgenus Crocodilus, but approximates closely to the Bornean 
species, whilst the Hordle crocodile much more closely resembles the 
crocodile of the Nile. As Dr. Buckland has given the name of Cro- 
codilus Spenceri to the Sheppey species, I propose to call the coeval 
species from the Hordle eocene Crocodilus Hastingsie, in honour of 
its accomplished possessor, whose zeal in the collection of the fossils 
in her Ladyship’s vicimity has contributed so much to advance our 
scientific knowledge of them. 
DESCRIPTION OF PLATE III. 
Fig. 1. Side view of mutilated cranium with permanent series of grinders; and 
those of the lower jaw, of Paloplotherium annectens, nat. size. 
Fig. 2. Grinding surface of upper premolars and molars and alveoli of canine and 
incisors, left side, of ditto. 
_ Fig. 3. Horizontal rami of lower jaw, showing symphysis and sockets of incisors 
aud canines, and grinding surface, deciduous and persistent molars, of 
ditto. 
Fig. 4. Side view of left ramus of lower jaw with deciduous molars and two per- 
manent molars in place, and with the premolars and Jast molar exposed 
in the formative cells, of ditto. 
Fig. 5. Grinding surface of an upper true molar of 4noplotherium commune : after 
CuvIER. 
Fig. 6. Grinding surface of an upper true molar of Paleotherium Aurelianense : 
after CUVIER. 
In the figures of the Paloplotherium 1 1, 2,3 indicates the first, second and 
third incisive sockets ; C, the socket of the canine; P 2, 3, 4, the premolars; M 
1, 2, 3, the molars; D 1, 2, 3, 4, the deciduous molars. The letters of the lobes 
and ridges are explained in the text. 
Part V.—Description of the Teeth and the Lower Jaw of an extinct 
species of Mammal belonging to the section of Hoofed Quadrupeds 
(Ungulata) having molar teeth with the principal lobes in sym- 
metrical pairs, and forming the type of a new genus (Dichodon) 
in that section. 
THE existing Ungulata, which have the principal lobes of the true 
molar teeth arranged in symmetrical or subsymmetrical pairs, are the 
Ruminantia and the genera Sus, Dicotyles and Hippopotamus, with 
i 
g 
