570 ON A NEW SPECIES OP KANGAROO (DORCOPSIS CIIALMERSIl), 



proved also that the specimen was a young animal : the temporary 

 premolar and temporary-molar, (1) were followed only by 2 molars, 

 with the third molar just cutting the gum. 



The plates appended to Garrod's paper made the comparison 

 easy between the dentition of this young Kangaroo and that of 

 Dorcopsis luctuosa. The form of the incisors of the canine and 

 of the permanent premolars (which I cut out of their formative 

 cells) was so different from that of the corresponding teeth of 

 Dorcopsis luctuosa, that I found it justifiable to describe this 

 animal as a new species : Dorcopsis Chalmersii, in honour of the 

 Rev. James Chalmers, the well-known and distinguished mis- 

 sionary of the South Coast of New Guinea. 



DORCOPSIS CHALMERSII. Mel. (Young $.) 



3i., 1 1 temp, p.m. 1 temp. m. 2 



— c., , -, — m., the 3rd m. cutting the gums 



1 1 temp, p.m. 1 temp. m. 2 



(1.) Prof. Flower says that "in Hypsiprymnus " (a germs which in many 

 respects agrees with the gen. Dorcopsis. Vide Prof. Owen on a new species 

 of Sthenurus. Proc. Zool. Soc, 1877, p. 357 and 358), "the reserve pre- 

 molar is relatively later in acquiring its position in the jaw than in 

 Macropus, being still in germ, at least in some species (pi. XXIX., fig. 4), 

 after the last permanent molar is in place and use." (W. H. Flower. On 

 the development and succession of the teeth in the marsupialia. Philos. 

 Transact, for the year 1867, p. 634). On pi XXIX., fig. 4, (I.e.) the 

 1 ' temporary " molar (coloured red) were followed by 4 " true " molars. 



Prof. Owen (loc. cit. Proceed, Zool. Soc , 1877. p 352), taking as the base 

 of his terminology a comparison of the dentition of the marsupials with 

 higher mammals (he compared as is well known, the dentition Macropus 

 Major with that of Sus scrofa. Loc. cit., p. 358), calls all the teeth between 

 the molars and canines, or [in case of the non-existence of the latter], the 

 incisors ; deciduous molars (Vide Prof. Owen on the Fossil Mammals of 

 Australia." Philos. Transact., 1874), which on the figures of the plates 

 illustrating the above paper, and others of the same author, are designated : 

 </\,(t 2, d 3, d 4 ; d 2 is the tooth I have called " the temporary premolar," 

 and d 3 "the temporary molar." In the last mentioned paper (p. 246), 

 Prof . Owen describing the dentition of Macropus (Halmatwus) erubescrns. 

 Scl., calls d 3 " the second deciduous molar." 



In the paper about Sthenurus (loc. cit., p. 353, and pi. XXXVII. , d 2 and 

 d 3 are called by Prof. Owen, " deciduous predecessors of the premolar." 



According to the last named author, the dentition of our young Dorcopsis 

 Chalmersii would consist of : — 



3 i., 1 c, d2 (I 3, d 4, and ml, or 



(temp, premolars.) 



1 i., d 2 d 3, d 4, ra 1, 







