MAMMALIA. 401 
Sus-Cuass II. Ovovivirara. 
Order 12. Marsupialia: Families ; Thylacinide, Dasyuride, Didelphide, 
Peramelide, Phalangistide, Halmaturide, Phascolomyide. 
Order 18. Monotremata: Fam., Echidnidz, Ornithorhynchide. 
The above systematic arrangement does not appear satisfactory to us, 
and we therefore substitute the one which follows, although well aware 
that it is far from being perfect. It will no doubt undergo some changes 
in the relative position of the minor groups; but so far as our great groups 
follow each other, we are confident that they express more exactly the 
development of the mammalian structure. 
Crass MamMMALIA. 
I. QuapRUMANA. 
Simiade, Cebide, Lemuride, Galeopithecide, Chiromyide. 
II. Carnivora. 
a. Unguiculata. 
1. Digitigrada. 
Felide, Hyznide, Canide, Viverride, Mustelide. 
2. Plantigrada. 
Cercoleptide, Procyonide, Urside. 
b. Pinnipedia. 
Phocide. 
II]. Cuerrorrera. 
a. Frugivora. 
Pteropodide. ; : 
b. Carnivora. 
Vespertilionide, Vampyride. 
IV. Insectivora. 
Erinaceide, Soricide, Talpide. 
V. Hersivora. 
a. Rodentia. 
Sciuride, Castoride, Muride (including Myoxina, Dipodina, 
Ctenodactylina, Murina, Spalacina, Arvicolina, Bathyergina, 
Saccomyina), Hystricide (including Hystricina, Dasyproctina, 
Echimyina, Octodontina, Chinchillina, Caviina), and Lepo- 
ride. 
b. Ruminantia. 
Bovide, Antilopide, Cervide, Moschide, Camelopardalide, 
Camelide. 
c. Pachydermata. 
Equide, Suide, Hyracide, Elephantide, Paleotheride, Rhino- 
cerotidze, Hippopotamide, Anoplotheride. 
605 
