MACKOPODID^;. 221 



to belong to an immature animal, but tbere is no evidence 

 that such is the case, and it might well have belonged to 

 an individual slightly older than the present specimen. 



Presented by Dr. George Bennett, 1872. 



pemctUatuS, Gray 1 . 



Syn. Petrogale penicillata, Gray 2 . 

 Heteropus penicillatus, auct. 



Of rather smaller size than the preceding, with true molars of the 

 same structure, but with the fourth premolar longer than the first 

 true molar. Since no molar characters generically distinguish this, 

 the type species of Petrogale, from the preceding and other forms, 

 it is advisable that in a palseontological classification it should be 

 included in the same genus. 



Hob. New South Wales. 



42658. The imperfect palate, showing all the cheek-teeth of the left 

 side ; from a cave in the Wellington Valley, New South 

 Wales. 

 Presented by the Trustees of the Australian Museum, 1870. 



42661 a. Fragment of the right maxilla, containing the first and 

 second true molars ; from the same locality. 



Same history. 



42591. The greater portion of the right ramus of the mandible, 

 containing the five cheek-teeth ; from the same locality. 



Same 



32316. Part of the left ramus of the mandible, showing a portion 

 of the incisor and the first four cheek-teeth ; from the 

 same locality. Purchased, 1857. 



32316 a. Two imperfect mandibular rami of young individuals, 

 showing p m . 3, mm. 4, mTT, and m . 2 ; from the same 

 locality. The outer wall of one specimen has been cut 

 away in order to exhibit pm. 4 in its alveolus. 



Same history. 



42660 b. Six imperfect mandibular rami of young individuals, show- 

 ing the same teeth as the preceding specimens ; from the 

 same locality. 

 Presented by the Trustees of the Australian Museum, 1870. 



42663. Anterior portion of the left ramus of the mandible of a 



1 In Griffith's ' Animal Kingdom,' vol. T. p. 204 (1827). 



2 Charlesworth's Mag. Nat. Hist. vol. i. p. 583 (1837). 



