. Elementary text-book of zoology. MAMMALIA 499 The skull is seen in side view in Fig. 343. Notice speci- ally the continuation of the malar to the glenoid cavity, and Fig. 343. -Lateral View of Skull of a Young Kangaroo. (Ad nat.) Lower Incisor. First Molar. Angle of Mandible. | Paroccipital Process. Note the dentition witli only two lower incisors, no canines and five cheek-teeth. Also the'Metatherian characters. Fig. 344.—Ventral View of Skull of Kangaroo x J. (Ad nat.) Incisor Teeth. the situation of the lacrymal foramen outside the orbit, the incomplete ossification of
. Elementary text-book of zoology. MAMMALIA 499 The skull is seen in side view in Fig. 343. Notice speci- ally the continuation of the malar to the glenoid cavity, and Fig. 343. -Lateral View of Skull of a Young Kangaroo. (Ad nat.) Lower Incisor. First Molar. Angle of Mandible. | Paroccipital Process. Note the dentition witli only two lower incisors, no canines and five cheek-teeth. Also the'Metatherian characters. Fig. 344.—Ventral View of Skull of Kangaroo x J. (Ad nat.) Incisor Teeth. the situation of the lacrymal foramen outside the orbit, the incomplete ossification of the palate and the in- flected angle of the lower jaw. The dentition is pecu- liar. There are three upper incisors, flat and chisel- shaped, then a space or diastema in which there are no teeth. The canines are absent, though occasionally present in some kangaroos, and there are five cheek- teeth. But the true dental formula of a kailgaroo is , so that there should be six cheek-teeth in all. The reason for the discrepancy is that the first premolar drops out at the same time that the second or last premolar. 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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