LIFE OF FLOWER 



109 



tion in a later chapter, the next noteworthy zoological 

 contribution from Flower's pen appears to be one on 

 the gular pouch of the great bustard, published in the 

 Zoological Society's Proceedings for 1865. This pouch, 

 which, it may be observed is confined to the cock-bird, 

 and inflated during the breeding season, is a very re- 

 markable structure, which has recently been described 

 in greater detail by Mr. W. P. Pycraft. 



Two years later (1867), Flower contributed to the 

 same journal a .paper on the anatomy of the West 

 African chevrotain, Hyomoschus aquaticus, or, as it is now 

 called, Dorcatherium aquatlcum. The specimen on 

 which the paper was based was the first of its kind 

 which had ever been dissected at least in this country ; 

 and the result of its examination was to confirm the view 

 that the mouse-deer, or chevrotains, cannot be included 

 among the true ruminants, or Pecora, but rather that 

 they form a group (Tragulina), in many respects inter- 

 mediate between the latter and the pigs and hippopota- 

 muses, or Suina. To the essential difference between 

 the chevrotains and the musk-deer, which have often 

 been confounded, Flower was very fond of recurring 

 in his later writings. 



About the year 1 866 Sir William began to turn his 

 attention to the teeth of mammals, more especially as re- 

 gards the mode in which the milk or baby series is suc- 

 ceeded by the permanent teeth, and the general homology 

 of the milk with the permanent, and of the individual 

 teeth of both series with one another. As the result of 

 these investigations he published during the next few 

 years the following papers on this subject. First and 

 most important, one on the development and succession 



