TEETIAllT TEETEBEATA OE THE FAYtM. 
L>5G 
iincortaiii wlietlier tliis luul two or three roots. In the mandible the only teeth preserved 
are the tliree ])Osterior preinolars. Figured PI. XXI. In the following table the 
dimensions (in centimetres) of this skiill are placed in the first column, the corresponding 
measurements in Protocettis atarus according to E. Fraas, and in Zeit(jJodon osiris 
according to Stromer, being given in the second and third columns respectively : — 
Length from the end of the suout to the occipital crest 
,, „ ,, ,, foramen magnum 
,, from hinder border of the uarial opening to the occi])ital crest . 
„ of tlie uarial opening 
Breadth of the narial opening 
Lengtli from the posterior border of the frontals to the occipital crest 
Width of the skull at the narial opening 
„ „ at the supraorbital expansion 
„ ,, between the temporal fossa; 
„ ,, at the zygomatic process 
Height of occipital surface above the upper edge of the foramen magnum. 
Width between outer ends of condyles 
„ of foramen magnum 
Length of premaxilla 
,, nasals 
(Ireatest breadth of nasals taken together 
Histance between jugal and postorhital process of frontal 
rozewjlodon 
rrniocetus 
Zevcjlodon 
airox. 
atavim. 
oairh. 
OU 
(30 
70 app. 
(31 app. 
58 
68 
36 
42 
36 
T app. 
7 
3-8 
2-5 
1 f)-5 app. 
20-5 
9-4 
4-3 
24-5 
lG-7 
24(?) 
4-5 
3-3 
34 app. 
24 
28 (?) 
11-8 
8 
13 (?) 
11 app. 
5 app. 
2-6 
29 
30 
34-5 
16-2 
18-5 
16 
4-5 
2-5 
4-4 
The dimensions (in centimetr 
alveoli) : — 
i. 1 (at alveolus) 
?■ 2 
5? 
'•3 ,, 
c- „ 
pm. 1 
Jim. 
jim.Vi 

m. 1 
Length of incisor scries 9 cm. 
• teeth (or. 
where absent. 
Length. 
Width. 
1-8 
1-2 
2-3 
1-4 
1-9 
1-3 
2-7 
I'S a])p. 
9 
9 
4-7 
P3 
1‘5 
1-8 
3-7 
1-7 
3-1 
1-8 
Length of premolar series IS'2 cm. 
M. S266. Portions of a much broken skull, including the ])ostcrior (cranial) n'gion, the Irontal 
expansion, the maxilla, and the premaxilla ; tin; last contains no tecdh, hut in the 
maxilla 4, and ])art of ?/;. 1 arc still in .sv’/c, and show the three roots of 
the premolars (text-fig. <S2). The cranial region is interesting, hecauso nearly all tin; 
sutures remain open, and the structure' of the occi])ita] region is well shown (text-fig. <S1). 
From this spc'cimen a hrain-cast similar to the natural hrain-cast ih'scrilx'd hv' 
Di’. Elliot Smitli * has been made (M. fi^tir)). The dimensions (in cc'ntimetrf's) ol 
this specimen are : — 
* 
Proc. Eoy. Soc. vol. 71 (lOUfi) ]>. 1322. 
