1154 DIRECTION OF THE HAIR ON THE BACKS OF SOME KANGAROOS, 



turned downwards, run on both bides of the median portion of 

 the chest. The hair on the arms and legs is directed normally 

 downwards. From the dividing line the hair on the hindparts 

 of the body as well as of the tail is as usual directed backwards. 

 The direction of the hair on the back in the female of Dendro- 

 lagus Dorianus is exactly the same as in the male (1), and can 

 very distinctly be observed in the young one (2). 



Besides the peculiar direction of the hair on the back, which as we 

 have seen, is not to be found in such an extent in the other species 

 of the genus (3), the dentition of D. Borimms shows a very marked 

 differential character, which does not appear in the other two 

 species. I mean the large size and shape of the central incisors 

 (fig. 3), which are in these respects very different in comparison 

 with those of D. ursinus and D. inustus (4). Although, as Mr. 

 Ramsay, in his paper about D. Dorianus, rightly observes, the 

 teeth of the specimens described by him are in " a very bad state, 

 being corroded by the liquid in which the skin was preserved " 

 (5), it seems to me, that the incisors have not suffered much. The 

 length of the central incisors of the male (in the present state), 

 is not less than 13 mm., or about ^ of an inch. Their external 

 surface is rounded, while the internal flat, worn down. Examined 

 from the front (fig. 4) the space between the central incisors on 

 their base is about 2 mm,, (or about /oi^i-)) ^^^ they touch each 

 other on their lower margin which is not pointed, but presents a 

 half rounded cutting edge. 



(1). The only sexual differences which I found in the pair of D. Doi'ianus 

 of the Macleay Museum, were : the smaller size of the female (the total 

 length of the cf , from tip of nose to end of tail, being 1340 mm., or 52 '2 in., 

 tail 560 mm, or 22-1 in. ; total length of the 9 1320 mm., or 51-4 in., 

 tail 550 mm., or 21-7 in.) and the hair of the end portion of the tail of the 

 female being longer. 



(2). The total length of the young (^ (from tip of nose to end of tail 

 665 mm., or 22-3 in., tail 270mm., or 10"7 in.) 



(3). Speaking in this paper about the " other " species of the genus 

 DtndrolcKjus, 1 refer only to D. msinus and D. inustufs. 



(4). Schki/d and Mimei: Loc. cit., pi. 23, figs. 2 and 5. 



(5). E. P. liamsay. Loc. cit., foot note to p. 17. The D. Dorianus 

 skins have been preserved, as I have been told by Mr. Ramsay, in common 

 salt, called ' ' brine. " 



