OCR Text |
Show 1897.] FROM NORTH AUSTRALIA. 325 68 mm. P3 and the milk p4 are fully developed; wil is just emerging from the alveolus. Middle stage. Two skulls, length 121 m m. and 126 mm., are just in the stage when p3 and the milk p4 are at the point of being changed. In both specimens the persistent/)4 is already developed in one of the upper jaws; in the other jaw p'A and the milk p4 are still present, but the persistent p4 is (in the largest specimen) visible above their roots through a bole in the maxillary. In the lower jaw on one side, too, the persistent p4 is developed, on the other side not. Adult stage. Two full-grown specimens, having the following sizes:- Male: length 152, breadth 80 mm. Female: „ 140, „ 74 „ Two other skulls belong, too, to old specimens 1, but are smaller, their length being 129-136 mm. In all these four skulls TO4 is fully developed ; a line between the tips of zygomatic processes will touch the middle (or in the old male the posterior part) of m\ Between the middle stage and the adult there are nine skulls (length from 119 mm. to 146 mm.), none of which have m4 fully developed. The line between the tips of zygomatic arches will touch the middle of m3, in the youngest specimens the posterior part of m2. Between the middle stage and the young one there are four skulls (length between 118 mm. and 123 mm.). P3 and the milk p4 are stdl present; TO3 is only half-developed. Hab. The commonest species in Arnhem Land and at Roebuck Bay, and met wdth everywhere along the great rivers ; especially numerous in the big bamboo-jungles. Native names: Ma, Bulak. 17. MACROPUS ROBUSTUS (Gould), 1840. Macropus robustus, Thos. Cat. Mars. Monotr. Brit. Mus. p. 22 (1888); Ogilby, Cat. Austral. Mamm. p. 58 (1892). N. Australia : South Alligator River, June 17th, 1895 (one specimen, a female, with a young one from its pouch). Skull. Length of the skull (female) 139 mm., breadth 77 mm. The last molar has not yet reached its full height. Hab. In the central tablelands, Arnhem Land, scarce, solitary. Native name: Tjikurr (male) ; Tjugeri (female). 18. PETROGALE CONCINNA, Gould, 1842. Petrogale concinna, Thos. Cat. Mars. Monotr. Brit. Mus. p. 71 (1888); Ogilby, Cat. Austral. M a m m . p. 48 (1892). N. Australia: Daly River, July 21st, 1894 (one specimen). Mary River, May 1895 (seven specimens and two embryos). Shin. In all specimens the white tips of the hairs on the back Sex undetermined, but probably both females. |