TKUTIATIY VKRTE15RATA OF THE FAYCfM. 
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incisors is ])r()l>ab]y, as already remarked, a ])rimitivc character derived from a 
(Jrc'odont ancestry; in Frozevr/lodon the canine seems to have been relatively larger 
even than in I’rotoceim. Another Creodont-likc character in the upper jaw is the 
))i-('sence within the j)osterior upper ])remolars of large fossie for the rccej)tion of tlui 
corresponding lower teeth. The pit for the reception of the point of the lo\ver ym. '1 
is on the alveolar border 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 
Zeuglodon osiris (see Stromcr, opt. cit. p. 07). 
Mandible (PI. XXI. fig. I e ; text-fig. 80). — The imperfect riglit ramns of the mandible 
is preserved, articulated with the type skull. The posterior portions of the coronoid 
])rocess 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 
quarter 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 
jjosteriorly, 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 nearly 
hat; the symphysis extended back to about the hinder border oi pm. 2. 
IjOwer Dentition (PI. XXI. hg. Ie ; text-fig. 80). — The anterior ])art of tlie 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 iq). The hrst 
tooth present seems to he 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 three 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 3, is also two-rooted: it 
is much largc'r than pm. 2, but the crown is imperfectly preserved ; both its anterior 
and posterior borders W’ere serrated, the posterior serrations being few and large, 
'file next tooth also is badly preserved ; it is smaller than ])m. 3, but the posterior 
serrations must have been hirger. llehind these premolars are the sockets of two or 
three molars, the anterior molar being apparently nearly as large the last premolar. 
The second molar is just being cut, and there are indications of a third molar behind it. 
Yeriebral Column (text-fig. 83). — Three anterior cervical vertebrie probably associated 
vith ])ortions of a skull w'cre collected by IMr. Peadnell, These s])ecimens are in a 
remarkably perfect state of preservation, and have almost the appearance of recent 
bones. In the atlae (text-tig. 83, A, D) the surfaces for the occipital condyles [cond.) are 
