TKKTIARY VKRTEBEATA OF THE FATO.M. 
252 
incisors is us already remarked, a primitive character derived from a 
Creodont ancestry; in Prozeuglodon the canine seems to have been relatively larger 
even than in Prvtoccfas. Another Creodont-like character in the upper jaw is the 
presence witliin the ])osterior upper ])remolars of large fossic for the reception of tin; 
corn'sponding lower teetli. The pit for the reception of the point of the lower pm. 2 
is on tlie alveolar b(n'der immediately behind pm. 1. In front of this the pits are 
on the outer side of the upper teeth, the upper and lower tooth-series crossing as in 
ZeiKjlodon osiris (see Stromer, op. cit. p. 07). 
Mandible (PI. XXI. hg. I e ; text-fig. 80). — The imperfect right ramus of the mandible 
is preserved, articulated with the type skull. The posterior portions of the coronoid 
process and of the angular region are broken away, while the horizontal ramus is 
imperfect anteriorly and has lost most of its ventral border. The condyle is strongly 
convex from before backwards, the articular surface forming rather more than a 
(piarter of a circle. From the condyle on the outer face of the jaw a strong shelf-like 
ridge runs forwards for a short distance, dying away in the strongly convex outer 
surface of the ventral ])art of the jaw ; when the jaws are closed, the jugal lies in the 
groove above this projection. The coronoid process is thin and high ; it is' imperfect 
jmsteriorly, but its anterior convex border is well preserved and in front slopes 
steeply down to the alveolar border, which, so far as the region occupied by the 
molars is concerned, is also strongly inclined downwards. The horizontal ramus was 
comparatively slender, its outer face convex from above downwards, the inner neaily 
hat; the symphysis extended back to about the hinder border oi pm. 2. 
Lower Dentition (PI. XXI. hg. Ie ; text-hg. 80). — The anterior ])art of the jaw is 
incomplete, and its upper border obscured by strongly adherent matrix, so that the 
alveoli of the incisors, canine, and hrst premolar are absent or covered up. The hrst 
tooth present seems to be pm. 2. This is a double-rooted tooth with a strongly com- 
pressed conical crown with sharp cutting-edges, the anterior of which is steeper than 
the posterior. On the anterior edge there are tliree or four small serrations, while on 
the posterior there are two accessory denticles of considerable size and a small cusp 
belonging to the cingulum. The next tooth, presumably -S, is also two-rooted: it 
is much larger than pm. 2, but tlie crown is imperfectly preserved ; both its anterior 
and posterior borders were serrated, tlie posterior serrations being few and large, 
'fhe next tooth also is badly preserved ; it is smaller than pm. 3, but the ])osterior 
serrations must have been larger. Behind these premolars are the sockets of two or 
three molars, the anterior molar being apparently nearly as largo the last ])reniolar. 
'I he second molar is just being cut, and there are indications of a third molar behind it. 
Vertebral Column (text-lig. 83). — 'fhree anterior cervical vertebreC probably associated 
Avith portions of a skull were collected by Mr. Beadnell. These specimens arc in a 
remarkably perfect state of preservation, and have almost the ajipcarancc of recent 
bones. In the atlas (text-fig. 83, A, D) the surfaces for the occi[)ital condyles [cond.) are 
