il ae 
ern 
based on the principle of Cephalization.—Herbivores, 183 
take their place at the head of the lower, before the Ruminants, 
because prosthenic, although decidedly hypotypic in shape, strue- 
ture and stupidity. 
2. Designations of the grades of subdivisions in the tribe of Herbr- 
vores.—Under the tribe of Herbivores, the subdivisions of the 
first grade, that is, those of Sthenorhines, Sthenomeres, and 
Sirenians, may be conveniently named subiribes. The subdi- 
Visions of the second grade, or those of Proboscideans, Tapir- 
ir ete., may be called ¢ribules, this word being diminutive 
of tribe. j 
It is to these Eocene species, according to all analogy, that we 
should look for the closest approximation of the two grand 
divisions of terrestrial Herbivores. And so in actual fact, the 
later exhibitions of the type. 
