LIFE OF FLOWER 147 



slight modifications, been very generally accepted by 

 later naturalists. Some time after the publication of 

 this paper the present writer pointed out to the author 

 that two of the generic names employed by him were 

 barred by previous use in a different sense ; and in a 

 note subsequently published in the Proceedings, these 

 were accordingly replaced. 



Flower was, however, by no means forgetful of his 

 earlier love for the cachalot and beaked whales (Physe- 

 teridae); and in 1883 and again in 1884 he published 

 papers in the Proceedings on their near relatives the 

 bottle-nosed whales (not to be confounded with the 

 bottle-nosed dolphins) of the genus Hyperoodon. In 

 these investigations he was much indebted, as on several 

 previous occasions, to the observations of Captain Gray, 

 a well-known whaler. As regards the common bottle- 

 nose (H. restrains). Sir William succeeded in demon- 

 strating that the great differences which had long been 

 noticed in the skull were due to distinctions either of 

 sex or age ; the old males developing huge maxillary 

 crests with a broad and flattened front surface of 

 which there is scarcely any trace in the younger mem- 

 bers of the same sex, or in females of all ages. In 

 consequence of this difference in the skull, the head 

 of the old bull bottle-nose is easily recognisable by the 

 abrupt and prominent elevation of the forehead immedi- 

 ately behind the base of the beak. Flower was also 

 able to show that bottle-noses yield true spermaceti, 

 especially in the head ; a fact which does not appear to 

 have been previously known to zoologists, although it 

 may have been to whalers. At the present day there 

 is a considerable trade in bottle-nose sperm-oil and 



