ZEUGLODON ISIS.— PROZEUGLODON. 
243 
})rocesses projecting upwards, outwards, and forwards ; the neural canal is very small, 
and there is a pair of prominences for the articulation of the chevron on the posterior 
lower border of the centrum. 
Text-tig. 79. 
Vertebra of (?) Zeuglodon isis: A, from left side ; B, from above. 
m]3., metapopbysis ; a. 5 ^ 5 ., neural spine ; tr.j)., transverse process. nat. size. 
These vertebrae may have belonged to the large form, Eocetus schiveinfurthi, 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. 
b. ' 
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 4- 
. . 
Length of neural arch 
9-5 
8-3 
8-2 
Genus PROZEUGLODON, gen. nov. 
Includes Zeuglodonts intermediate between Protocetus and Zeuglodon proper. 
The dental formnia is: i. y, c. pm. m. as in Z. osiris. The crowns of the 
molars and the three posterior premolars have accessory denticles on their sharp 
2i2 
