Mesohippus and Miohippus are connected with the earliest and most primitive mammal which it is possible to include in the family Equidae by means of Epihippus of the Uinta or Upper Eocene of North America, and Pachynolophus, or Orohippus, of the Middle and Lower Eocene of both halves of the northern hemisphere.
MEGATHERIUM (properly Megalotherium), a huge extinct edentate mammal from the Pleistocene deposits of Buenos Aires, typifying the family Megatheriidae (or Megalotheriidae), and by far the largest representative of the Edentata.
In the eastern part of the country the rhinoceros is met with, and the rivers swarm with crocodiles and with a curious mammal called the ayu, bearing some resemblance to the seal.
In mammals Sir William Flower pointed out that a generalized type of liver exists, from which that of any mammal may be derived by suppression or fusion of lobes.
VISCACHA, or BISCACHA, a large South American burrowing rodent mammal belonging to the family Chinchillidae and commonly known as Lagostomus trichodactylus, although some writers prefer the name Viscacia.
LEMMING, the native name of a small Scandinavian rodent mammal Lemmus norvegicus (or L.
The mammal fauna of the Indian region of Asia is much more highly developed than that of the Palaearctic. The Quadrumana are represented by several peculiar genera, amongst which are Semnopithecus, Hylobates and Simia.
CHINCHILLA, a small grey hopping rodent mammal (Chinchilla lanigera), of the approximate size of a squirrel, inhabiting the eastern slopes of the Andes in Chile and Bolivia, at altitudes between 8000 and 12,000 ft.
These include Protozoa, three sponges, Vermes, twenty-five Molluscs, numerous Amphipods, fishes of the genera Gobius, Benthophilus and Cobitis, and one mammal (Phoca caspia).
Many a large mammal coming to drink at its accustomed place is dragged into the water by the lurking monster.