Prof. Owen on the Class Mammalia. oo ae 
the under jaw, in another genus (Elephas) from the upper jaw, 
and in some of the species of a third genus (Mastodon), from 
both jaws. There are no canines; the molars are few, large and 
transversely ridged; the ridges sometimes few and mammillate, 
_ often numerous and with every intermediate gradation. The 
hose is prolonged into a cylindrical trunk, flexible in all diree- 
hons, highly sensitive, rae terminated by a prehensile append- 
age ike a finger: on this organ is founded the name PRogos- 
CIDIA given tothe order. The feet are pentadactyle, but are 
indicated only by divisions of the hoof; the testes are abdominal ; 
placenta is annular ;* the mamme are pectoral. 
th the present and preceding orders of Ungulata may be 
called aberrant: the dentition of the Toxodon, and several par- 
ueulars of the organization of the Elephant, indicate an affinity 
o the Rodentia; the cranium of the Toxodon, like that of the 
invthere, resembles that of the Sirenia in its remarkable modi-. 
-Neations, , 
The typical Ungulate quadrupeds are divided, according to 
the odd or even number of the toes, into PERISsSODACTYLA and 
ARTIODACTYLA.+ 
Ports are large, in some disproportionately so, and the digit is 
Symmetrical: the same applies to the ectocuneiform and the 
tof the penultimate one. The pte 
‘ i p ) ) . 
Thy taick base, and is perforated lengthwise by the ectocarotid. 
crown of from one to three of the hinder premolar? is as 
* Besi each pole of 
ides the annular placenta there is a subcircular villous patch at pole 
the ‘onic bag, by which it deckied additional attachment to the uterus, in the 
t From Aone : ero; and Ggrvog, par 
AEE esti, ir np er ee 
’ 
