332 







R. J. Anderson, 













Nasal 



Length 

 of skull 



Fr. 



Par. 



Parhreadth 

 Ant. Post. 



Height of 

 skull not 

 mandible 



Length 



of cranial 



cavity 





cm 



cm 



cm 



cm 



cm 



cm 



cm 



cm 



Capybara 



— 



25,0 



8,0 



4,3 



6,5 



5,0 



6,0 



8,5 



Beaver (Castor) 



— 



12,5 



3,5 

 2,5 (lat.) 



4,5+6 

 I. P. (lat.) 



2,0 



2,5 



5,5 



6,6 



M. Rattas 



— 



5,0 



1,9 



0,8.0,5 

 IP. 



1,2 



1,3 



1,3 



2,4 



Rabbit (Cuniculus) 



3,3 



8.5 



3,0 



1,8.0,8 



1,4 



1,1 



3,5 



4,3 



Hare (Lepus timidus) 2,0 



8,0 



3,1 



2,0 



1,5 



1,2 



3,3 



4,2 



Cephalelapbus 



5,5 



14,6 



6,0 



2,0 



4,5 



9,0 



— 



7,0 



Acronotus 



18,0 



39,0 



22,0 . 



3,5 



2,0 



4,0 



— 



— 



Equus 



13,0 





7,0 13 



+ 2,5 



5,0 5,5 4 



10,0 



17,0 



Antilope 



— 



18,0 



5,4 



4,5 



4,1 



1,5 



— 



8,5 



Bos juv. 



15,5 



40,0 



19,0 



3,5 



6,0 



5,5 



— 



12,5 



Ovis 



9,0 



25,5 



8,5 



3,5 



5,0 



3,0 



— 



9,2 



Ovis II 



8,5 



23,5 



9,5 



4,0 



2,5 



— 



— 



9,5 



Cervus 



6,0 



19,0 



6,4 



3,0 



2,5 



7,5 



— 



9,0 



lat. — lateral diameter; 



L P. = 



Inter Parietal 



; Ant. = 



Ajiterior; Post. = Po.sterior. 



Fig. 27. 

 River Dolphin. 



The River Dolphin has parietals that approach those of Prohoscidia. 



The frontal in advancing- backwards in the middle line may lead 

 to complete obliteration of the interparietal suture. Owen gives the 

 case of a Cebus in which the frontal touched the occipital and separated 

 the parietals. The same observer met also with a gibbon (Hj^lobates) 

 in which the same variety occurred. The growth of the maxillae 

 and occipitals causes the well known quaintness in the skulls of ceta- 

 ceans. The frontals thus become largely hidden and the parietals 

 shrink. The latter bones have a forward extension at the anterior 

 inferior angle in several groups whilst in others the parietals do not 

 reach the sphenoids owing to the alae being less developed or to the 



