188 Prof. Owen on the Class Mammalia. 
The three primary divisions of the Gyrencephala are of higher 
value than the ordinal divisions of the Lissencephala; just as 
those orders are of higher value than the representative families 
of the Marsupials. 
marine, and, for the most part, range the unfathomable ocean; 
limits respects species. 
The nostrils are two, situated at the upper part of the snout ; 
the lips are beset with stiff bristles; the mamme are pectoral; 
the testes are abdominal, as in the Cetacea, but are associa 
With vesicule seminales. The Sirenia exist near coasts or ascend 
large rivers, browsing on fuci, water plants or the grass of the 
shore. There is much in the organization of’ this order that 1 
dicates its affinity to members of the succeeding division. _ 
In the Ungulata the four limbs are present, but that portion of 
the toe which touches the ground is incased in a hoof, which 
blunts its sensibility and deprives the foot of prehensile power 
With the limbs restricted to support and locomotion, the Ung 
lata have no clavicles: the fore-lez remains constantly in the 
which 
the 
* Philosophical Transactions, 1858, p. 291. 
