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Monotremata :: Monotremata (n. pl.) A subclass of Mammalia, having a cloaca in which the ducts of the urinary, genital, and alimentary systems terminate, as in birds. The female lays eggs like a bird. See Duck mole, under Duck, and Echidna..

Toxodonta :: Toxodonta (n.pl.) An extinct order of Mammalia found in the South American Tertiary formation. The incisor teeth were long and curved and provided with a persistent pulp. They are supposed to be related both to the rodents and ungulates. Called also Toxodontia.

Lyencephala :: Lyencephala (n. pl.) A group of Mammalia, including the marsupials and monotremes; -- so called because the corpus callosum is rudimentary..

Marsupialia :: Marsupialia (n. pl.) A subclass of Mammalia, including nearly all the mammals of Australia and the adjacent islands, together with the opossums of America. They differ from ordinary mammals in having the corpus callosum very small, in being implacental, and in having their young born while very immature. The female generally carries the young for some time after birth in an external pouch, or marsupium. Called also Marsupiata..

Cheiroptera :: Cheiroptera (n. pl.) An order of mammalia, including the bats, having four toes of each of the anterior limbs elongated and connected by a web, so that they can be used like wings in flying. See Bat..

Mammal :: Mammal (n.) One of the Mammalia.

Ovulation :: Ovulation (n.) The formation of ova or eggs in the ovary, and the discharge of the same. In the mammalian female the discharge occurs during menstruation..

Order :: Order (n.) An assemblage of genera having certain important characters in common; as, the Carnivora and Insectivora are orders of Mammalia..

Pilifera :: Pilifera (n. pl.) Same as Mammalia.

Mammiferous :: Mammiferous (a.) Having breasts; of, pertaining to, or derived from, the Mammalia..

Breast :: Breast (n.) Either one of the protuberant glands, situated on the front of the chest or thorax in the female of man and of some other mammalia, in which milk is secreted for the nourishment of the young; a mamma; a teat..

Implacentalia :: Implacentalia (n. pl.) A primary division of the Mammalia, including the monotremes and marsupials, in which no placenta is formed..

Tillodontia :: Tillodontia (n. pl.) An extinct group of Mammalia found fossil in the Eocene formation. The species are related to the carnivores, ungulates, and rodents. Called also Tillodonta..

Pseudocoelia :: Pseudocoelia (n.) The fifth ventricle in the mammalian brain. See Ventricle.

Mammaliferous :: Mammaliferous (a.) Containing mammalian remains; -- said of certain strata.

Vertebrata :: Vertebrata (n. pl.) One of the grand divisions of the animal kingdom, comprising all animals that have a backbone composed of bony or cartilaginous vertebrae, together with Amphioxus in which the backbone is represented by a simple undivided notochord. The Vertebrata always have a dorsal, or neural, cavity above the notochord or backbone, and a ventral, or visceral, cavity below it. The subdivisions or classes of Vertebrata are Mammalia, Aves, Reptilia, Amphibia, Pisces, Marsipobranchia, and Lep

Zonaria :: Zonaria (n. pl.) A division of Mammalia in which the placenta is zonelike.

Dermoptera :: Dermoptera (n. pl.) An order of Mammalia; the Cheiroptera.

Mammalia :: Mammalia (n. pl.) The highest class of Vertebrata. The young are nourished for a time by milk, or an analogous fluid, secreted by the mammary glands of the mother..

Unguiculata :: Unguiculata (n. pl.) An extensive division of Mammalia including those having claws or nails, as distinguished from the hoofed animals (Ungulata)..

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