180 Prof. Owen on the Class Mammaiia. 
The third leading modification of the Mammalian cerebrum is 
such an increase in its relative size, that it extends over more or 
less of the cerebellum; and generally more or less over the olfac- 
py ge obes. Save in very few exceptional cases of the smaller 
and inferior forms of Quadrumana (fig. 3), the superficies is folded 
into more or less numerous gyri or convolutions,—whence the 
name @YRENCEPHALA,* which I propose for the third subclass 
of Mammalia (fig. 4). i 
.—Uninpanzee, 
————— 
= == 
——4 
\ 
ANN 
IY 
W 
AA 
In'this subclass we shall look in vain for those marks of affin- 
ity to the Ovipara, which have been instanced in the preceding 
subclasses, The testes are, indeed, concealed, and through an 
high and justly-earned reputation of both these naturalists gt it incumbent 
affini e Rodentia to ihe 
1s 
term “a place 
a ym 
ments urged by Mi ei Awards The first of th 
a, pease 
alleged resemblance of placental i sae expressed by the 
coide, so rigger cr a characte to the Bimana, Quadrumana, Cheiropter: 
vely. 
and shee di 3 an nid Mae acacus on the other, seem te 
i The pedu aah iat 
neti u ity, is th e2 ders. 
function of the vitellicle or ae sac in the feet mb of the two or ot 
But, | regards orm, the cotyloid ame of the Muride differs ™ ev 
from the thin, expanded and subdivided placenta of the Hare, than it does coe 
that of the ee oset Monkey: then, it aro oe ething in the argument 
brain. 
* yvgde, to bend or wind, and tyxéqahos, 
