84 FOSSIL JAWS OF MACROPODID^f:, 



Succession of teeth. 



The two anterior true molars are still l^ut little affected by 

 wear when p> has reached a forward stage of incubation, and in 

 the lower jaw p.'^ is still in position and little worn when the 

 hind lobe of m. "-^ is well advanced and its fore lol^e nearly in use. 

 The upper premolar and last molar are half worn down simultane- 

 ously, m.^ being at the same time reduced almost to a shell. 

 From these data it would seem that the anterior true molars 

 rapidly develop in the young jaw; that the upper premolar 

 probably rises simultaneously with m.^, and that it persists to an 

 advanced period of life. 



The immediate affinities of Palorchestes are with Halumturus 

 rather than with Macropirs. 



Examqyles — ? tine. 



Maxillary.— K cast of the palato-maxillary region of the skull 

 with all the cheek-teeth; original in the Australian Museum. Like 

 the cast, which has the same history and is numbered M. 2573 in 

 the British Museum Catalogue, it is inscribed " Macropus^^'' and 

 is without an}^ doubt from the same mould — Portion of a right 

 maxilla of a young example with m. ^, m.'- and the crypt of p.* 

 — An isolated m.*, an isolated m.'"', and an isolated m.". 



Mandibular. — Portion of a left ramus, with p.*, m, ^, m. ^, 

 aged, vascular foramen distinct — A left ramus with m.^ perfect 

 and remains of m.- and m.^, adult, vascular foramen distinct — 

 Part of an isolated m.* — Associated rami of a young mandible 

 wdth i.^, p. '^5 mp.*, m.-, from the Peak Downs. 



Palorchestes parvus, n.s. 



Constantly smaller than F. azael, the cheek teeth measuring- 

 less than 100-0. Upper fourth premolar with a distinct anterior 

 talon, lobe of the lower fourth premolar deejDly emarginated on 

 the posterior surface of the inner side, its area of abrasion narrow, 

 angular, and extended transversely. 



