- Teeth of Upper Jaw of Opossum (Didelphys marsupialis), all of which are unchanged, except the third premolar, the place of which is occupied in the young animal by a molariform tooth, represented in the figure below the line of the other teeth.
Deciduous premolar preceded by a minute molariform tooth, which remains in place until the animal is nearly full grown.
These teeth, adapted to various requirements, vary according to the genus, being conical, hooked, spoon-shaped, molariform, &c.
In all the dentition is of the hypsodont type, with the hollows of the cheek-teeth filled by cement, the premolars molariform, and the first small and generally deciduous.
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