IG2 
TERTIARY VERTEBRATA OF THE EATCtM. 
Tho dimensions (in centimetres) of some of the above specimens are : — 
Width between outer edges of articulation 
C. 9094. 
C. 9074. 
C. 8201. 
C. 8315. 
M.8856 a. 
M. 8850 6. 
for skull 
15-5 
15-5 
16 
15-7 
15-3 
15 
„ of surfaces for axis 
13-5 
12 
13 
12 
12 
12 
,, to ends of transverse processes . . 
25-7 
25 app. 
26-4 
25-4 
C. 8079. Nearly complete axis vertebra. This specimen shows the large peg-like, somewhat 
compressed odontoid with distinct ventral facet, the strong hypapophysial ridge, the 
very high neural arch with the neural spine deeply hollowed out posteriorly by a deep 
fossa for the attachment of ligaments. 
M. 9123. Atlas vertebra similar to last, but less nearly complete. 
M. 8857. Imperfect centrum of smaller axis. Presented by the Egyptian Government, 1904. 
The dimensions (in centimetres) of the above axis vertebrse are : — 
C. 8079. 
M.9123. 
M. 8857. 
liength of centrum with odontoid 
. 12-5 
12 app. 
9-5 
Width of surface for atlas .... 
11 app. 
11 app. 
10 
„ posterior face of centrum . 
7'5 app. 
8 
Height to top of neural spine . . . 
. 14 + 
15-5 
„ of neural canal 
3 
3’5 app. 
M. 8513. Right astragalus. Figured in text-fig. 52. The dimensions (in centimetres) are : — 
Width of tibial surface, including facet for internal malleolus .... 8 
,. calcaneal surfaces 8 
„ navicular surface 7’7 
Presented by IF. E. de Winton, Esg., 1903. 
C. 8355. Portion of left astragalus. 
C. 10063. Imperfect left calcaneum. 
Palaeomastodon parvus, Andrews. 
[Text-figs. 50 C, 55-59.] 
1905. Pakeomastodon parvus, C. W. Andrews, Geol. Mag. [5] vol. ii. p. 5G2. 
Type Specimen . — Imperfect right ramus of mandible, with pm. 3-4 and m. 1-3 in 
.situ, (text-fig. 55) ; British Museum. 
This species is distinguished from P. headnelli by its small size, but at the same 
time it approaches that species very nearly in the comparative simplicity of its teeth, 
])articularly in the form of m. 3, and in having the posterior end of the mandibular 
symphysis some distance in advance of the anterior ])remolar, a character which at 
once distinguishes it from P. wintoni. The third molar (text-figs. 50 C, 55) consists of 
two transverse ridges, each composed of two tubercles, and a small third ridge consisting 
