. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. •264 MAHSUPIALIA. teetli on each side cf the lower jaw. The four posterior molars in each row are true, and bear four pyramidal cusps, excepting the last tooth in the upper jaw, which, as in Ph. Cookii, has only three cusps. In the upper jaw the space between the functional false molars and the in- cisors is occupied by two simple rudimentary teeth, the anterior representing the canine ; but being relatively smaller than in Ph. Cookii, the crowns of the two anterior incisors are rela- tively larger. In the lower jaw the
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. •264 MAHSUPIALIA. teetli on each side cf the lower jaw. The four posterior molars in each row are true, and bear four pyramidal cusps, excepting the last tooth in the upper jaw, which, as in Ph. Cookii, has only three cusps. In the upper jaw the space between the functional false molars and the in- cisors is occupied by two simple rudimentary teeth, the anterior representing the canine ; but being relatively smaller than in Ph. Cookii, the crowns of the two anterior incisors are rela- tively larger. In the lower jaw the sloping alveolar surface between the functional molars and large procumbent incisors is occupied, ac- cording to M. Fr. Cuvier, by two rudimentary mimiie teeth, as represented in the figure (fig. 88). I have/jiot found any trace of these Fig. Petaiirus Taguanoides. in the two skulls of Pet. Taguanoides examined by me. In Ph. Cookii we have seen that there are three minute teeth in the correspond- ing space ; but these differences would not be sufficient ground to separate genetically the two species if they were unaccompanied by modifications of other parts of the body. In Petaurussciurcusand Petauruxjiaviventer the dentition more nearly resembles that of Phulangista vulpina. In the upper jaw the functional molar series consists of five teeth on each side; the four hinder ones being, as in Pet. Taguanoides, true tuberculate molars, but diminishing more rapidly in size as they are placed further back in the jaw; the hinder tooth has three tubercles, the rest four; the apices seem to be naturally blunter than in Pet. Taguanoides, Between the functional ptu-molar and the incisors there are three teeth, of which the Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Todd, Robert Bentley, 1809-1860
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