ZEUGLODOX ISIS.— rUOZEUG LOGON. 
24 .‘} 
prooossos projecting npwiirds, outwards, and forwards; tlie nonral canal is very small, 
and there is a ])air of prominences for tiie articulation of the chevron on the posterior 
lower border of the centrum. 
Text-fig. 79. 
Vertebra of (?) Zeuglodon isis: A, from left side ; B, from above, 
metapopbysis ; neural spine ; tr.j)., transverse process. ^ nat. size. 
These vertebrm may have belonged to the large form, Eocetus schivewfurtlu, Fraas, 
but their similarity to the vertebrae of the American Zeuglodonts makes it more 
probable that they belong to a member of the type genus, and therefore in the absence 
of associated skull or mandible they are placed here. 
The dimensions (in centimetres) of some of these vertebrae are : — 
Lumbars. Cauclals. 
a. 
h. 
c. 
d. 
Length of centrum (without epiphysis) .... 
20-3 
21 
18-5 app. 
20-3 
19-5 
Width of anterior face of centrum 
17-5 
16-5 
15-5 app. 
14 
13 app 
Height of anterior face of centrum 
14 app. 
13-5 
12 app. 
10 
Width between outer ends of transverse processes . 
29 
32-4 
27-i- 
Length of neural arch 
9-5 
8-3 
8-2 
Genus PROZEUGLODON, gen. nov. 
Includes Zeuglodonts intermediate between Protocetus and Zeuglodon proper. 
The dental formu'a is: 1. c. gun. as in Z. osiris. The crowms of the 
molars and the three posterior premolars have accessory denticles on their sharp 
2i 2 
