ZEUGLODON ISIS.— PEOZEUGLODON. 



243 



processes 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-fig. 79. 



Vertebra of (?) Zeuglodon isis : A, from left side ; B, from above. 

 mp., metapophysis ; n.sp., neural spine ; tr.p., transverse process. ^ nat. size. 



These vertebrae may have belonged to the large form, Eocetus schweinfurthi, 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. 



Caudals. 



a. 

 Length of centrum (without epiphysis) .... 20-3 



Width of anterior face of centrum 17-5 



Height of anterior face of centrum 14 app. 



Width between outer ends of transverse processes . 29 

 Leugth of neural arch 



b. 



21 

 16-5 

 13-5 

 32-4 

 9-5 



18-5 app. 

 15-5 app. 

 12 app. 

 27+ 

 8-3 



d. 



20-3 



14 



10 



e. 

 19-6 

 13 app. 



8-2 



Genus PEOZEUGLODON, gen. nov. 



Includes Zeuglodonts intermediate between Protocetus and Zeuglodon proper. 

 The dental formula is : i. |, c. i, jam. |, m. ^3, as in Z. osiris. The crowns of the 

 molars and the three posterior premolars have accessory denticles on their sharp 



