Marsupialia, compared with placentata.
"More Letters of Charles Darwin Volume II" by Charles Darwin
The field mouse and rabbits are rodentia, the deer ungulata, the kangaroos marsupialia.
"Concerning Animals and Other Matters" by E.H. Aitken, (AKA Edward Hamilton)
From the primary mammal arose the pouched animals (marsupialia).
"Was Man Created?" by Henry A. Mott
The Monotremata and Marsupialia have curious Y-shaped spleens.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8" by Various
Marsupialia (or Metatheria), 161.
"Stories of the Universe: Animal Life" by B. Lindsay
SEVENTEENTH STAGE: +Pouched Animals (Marsupialia)+.
"The History of Creation, Vol. II (of 2)" by Ernst Haeckel