TEItTFARY VERTEBEATA OF THE FATtiM. 
() 
C. 10054. liii|)(M-f(‘ct skull, wiinting the zyoomatic arches and much of the ba.se and left side of the 
cranium. The teeth are badly preserved or represented by the alveoli only ; the dental 
formula is /. 2 or ?>, c. 1, ]>m. 4, m. 4. Type s{)ecimen described and figured in Geol. Mag. 
lor. at. xiijm'i, also figured on PI. XX. figs. 1, 1 a, 1 b. This specimen forms the basis 
for the descri])tion of the skull given above. Its princi{)al dimensions (in centimetres) 
arc : — 
Extreme length 30 
Width between outer angles of occipital condyles .... 7’5 
Oreatest width of occipital surface 13 aj)p. 
Width ol foranien magnum 3‘4 
.1 leight of occipital surface above /b/Y/me/t .... 0'5 
Width of skull-roof at lambdoidal ridge 5 0 app. 
„ „ narrowest point, oppo.site the middle 
of the temporal fossm 4-4 
Width between ends of supraorbital processes S'8 
,, of snout in front of external nares 4-7 
Length of narial opening G'7 
Width of narial opening 3-3 
Length of dental series from canine to last molar . . . . 11-4 
,, four molars 5'5 
Owing to the somewhat crushed condition of the specimen, some of the above 
measurements are only approximate. 
M. 8581. Plaster cast of the above specimen. dfade in the British Museum. 
M. 8581a. Plaster cast of the brain-case of the above specimen (text-fig. G5). 
dlade in the British Museum. 
C. 10190. Anterior portion of skull of a larger individual than C. 100.54. This specimen is 
associated with the cervical, donsal, and caudal vertchrm described above (PI. XX. 
ligs. 4-G), and with the right os innominatum (text-fig. (!8, B). The dimensions (in 
•entiinetres) of the vertebrae are : — 
Anterior 
cervical. 
(?) Anterior 
lumbar 
(lig- ■!)• 
Sacral 
(fig. d). 
Anterior 
caudal 
(fig. 5). 
Caudal. 
Width of centrum 
3-8 
5-1 
5-6 
6-2 
5-S 
Height of centrum 
2-3 
4-5 
4 
5-3 
4-2 
Length of centrum 
1-8 
4-2 
4 
3-7 
4-1 
AV^idth between ends of transverse processes . 
12 
13 + 
19 
13-4 
13-8 
Height to top of neural spine 
8-5 + 
8-7 
8-5 
8-2 
The dimensions (in centimetres) of the os 
Total length 
innominatum (text-fig. G8, 
17-7 
B) are : 
Length of ilium from centre of acetabulum 
,, pubis from centre of acetabulum 
„ ischium from centre of acetabulum 
Greatest width of ilium 
,, „ ischium 
0-7 
4-2 
8 -(> 
2 -(: 
4-1 
