Prof. Owen on the Class Mammalia. 187 
The following table exemplifies the correspondence of the 
groups in the Lyencephalous and Lissencephalous series :— 
LyENCEPHALA, LIssENCEPHALA. 
Rhizophaga* Burrowing Rodentia. 
Poéphaga Dipodide re Leporide. 
claus eromys, ; 
Phalangistidee Sciuride and prehensile-tailed 
arboreal Roelents. 
Phascolarctos Bradypus, 
Pevameles and Mymecobius FErinaceide. 
Chero acroscelis, 
Didelphys and Phascogale  Soricide. 
Dasyurida Centetes, Gymnura. 
Echidna Manis. 
Ornithorhyncus Orycteropus. 
The classification proposed by M. Gervais, already cited (p. 
179), in which the Rodentia, Cheiroptera, and Insectivora are asso- 
Jn the same high primary group with the Quadrumana 
we Bimana, is avowedly adopted from that previously proposed 
by Prof. Milne Edwards.+ 
next proceeding to consider the subdivisions of the Gyren- 
la, we seem at first to descend in the scale in meeting wi 
+ Stoup of animals in that subclass, having the form of fishes; 
but a high grade of mammalian organization is masked beneath 
this form, "The Gyrencephala are primarily subdivided, accord- 
ing to modifications of the locomotive organs, into three series, 
for which the Linnean terms may well be retained; viz. Muélata, 
"gulata and Ungwiculata, the maimed, the hoofed, and the 
clawed series, : 
*se characters can only be applied to the Gyrencephalous 
~48S; 2. e. they do not indicate natural groups, save in that 
Tot of the Mammalia. To associate the Lyencephala and 
lissencephala with the unguiculate Gyrencephala into one great 
Tey group, as in the Mammalian systems of Ray, Linnzeus 
tha Cuvier, is a misapplication of a solitary character akin is 
“twhich would have founded a primary division on the discoi 
“ita or the diphyodont dentition. No one has proposed to 
An. the unguiculate Bird or Lizard with the unguiculate 
Pe, and it is but a little less violation of natural affinities 
SSO¢iate the Monotremes with the Qaudrumanes 1n the same 
Rmary (unguiculate) division of the Mammalian class. 
it ra eae Classification of the Marsupialia,” in the Zoological Transactions, vol. 
t See note at p. 179, 
