NARWHAL. 



439 



of examining in the University Museum at Cambridge, 

 and which has been described and figured by our friend 

 Mr, J. W. Clarke in the Zoological Society's " Proceed- 

 ings " for 1871. In this specimen the left tusk measures 

 six feet seven inches, and the right, which has been broken, 

 six feet one inch. There is only one other bidental skull in 

 Britain, that of a young animal at Hull, and Mr. Clarke 

 only knows of nine others in the Continental Museums. 

 He also points out that the statement that the right tusk 

 is sometimes developed, while the left remains abortive, 

 appears to be an error, no such specimen is preserved in 

 any collection, and those who have examined most skulls, 

 as Scoresby and Prof. Reinhardt, never met with such a 

 case. 



