72 
TEllTIAET VERTEJ3EATA OF THE FAYOM. 
lias been selected I'roni the collection at Cairo as forming an approximately complete vertebral 
column. Owing, liowcA cr, to the great variation in size in individuals of the present species it was 
impossible to make a very satisfactory set, and it is not even certain that some of the smaller 
vertebrae may not belong to Paltvotnafilodon. Only the discovery of an associated series can make 
it jiossible to settle detinitely the structure of the vertebral colnmn and the number of vertebrae 
composing its different regions. The description given above (pp. 27-32) is founded on this series, 
and the figures also are, for the most part, taken from vertebrae composing it. The numbers of 
the vc'rtebrae behind the cervical region are only approximate. 
C. 8303. Third cervical vertebra (text-fig. 10, A). 
C. 9097. Fourth cervical vertebra. 
C. 8294. Fifth cervical vertebra (text-fig. 10, B). 
C. 9083. Sixth cervical vertebra. 
C. 9082. Seventh cervical vertebra (text-fig. 10, E). No vertebrarterial canal. Rib-facets on 
hinder face at ventral outer angle of centrum. 
The dimemsions (in centimetres) of these cervicals are given in the following table : — 
C. 8303. 
C. 9097. 
C. 8294. 
C. 9083. 
0 9082. 
Greatest width of ceutrum . . . . 
. . . 13-6 
14-5 
13 
13 
135 
„ height „ ... 
... 11 
11 
11-3 
11 
11 
Length of centrum (in middle) . . 
... 3-3 
4-7 
4-7 
6 
5 
Height to top of arch 
... 18 
17-1 
17-5 
. . 
18-7 
Width at transverse processes 
... 29 
21-5 
23-5 
Heiglit of neural canal 
. . . . 4 
4 
4-3 
5 
C. 9089. Anterior thoracic vertebra. Sjune higher than in last cervical. 
C. 8270. Anterior thoracic vertebra. At this point there is probablj' a gap in the series. 
C. 7806. Thoracic vertebra (text-fig. 11). S})ine very high, broad. 
C. 8316. Thoracic vertebra belonging to a smaller individual than the last. 
C. 9215. Thoracic vertebra of a small individual. Neural spine shorter than in last. 
C. 9091. Thoracic vertebra (text-fig. 12). Centrum is somewhat narrowed ventrally. Broad, 
flattened, transverse processes, with oval flat rib-facets (t./.) towards the front of their 
outer ends. Neural spine (n.sji.) strongly inclined backwards, upper end slightly bifid. 
The dimensions (in centimetres) of the last six verfebiae are given in the following table: — 
Height of centrum .... 
AVidtli „ .... 
Length (on ventral side) . . 
Height to top of neural spine 
Width at transverse processes 
Behind C. 9091 there seems to be 
vertebra is shown in text-fig. 13. 
C. 9089. 
C. 8270. 
C. 7800. 
C.831G. 
0 921. '3. 
C. 9091. 
JO 
10-2 
10-5 
8-2 
8'2 
7'7 
13-7 
13-5 
12-5 
11 
10 
1()'3 
0-5 
7-4 
6-8 
6 
6-5 
22 -p 
27 
24 
26-2 
19-7 
24 
26-7 
26 
25-6 
gap in the 
series, in which the 
neural 
spines shortened, the 
, and the 
zygapophy 
ses bccanu 
cylindroid. This type of 
