A RARE BEAKED WHALE. 



421 



the presence of the single pair of large teeth just lielund the hind 

 end of the symphysis of the lower jaw. These teeth are. however, 

 quite difierentin shape from those of Sowerby's Beaked Whale (J/. 

 bidens) — a species unknown in the Southern Seas ; and the whole 

 jaw is likewise different, as Mr. FitzSimons has pointed out, from 



Text-fio-. 138. 



Palatal aspects of cranium and lower jaw of Ileso^lodon {Dio^ludoii) (J)'ayi. 



that of the South African Blainville's Beaked Whale {A£. clensi- 

 rostrls), in which the forna of the teeth is also distinct. On the 

 other hand, in the great size of their basal portion and the upright 

 position of the terminal cap, the teeth agree exactly with those of 

 Proc. ZooL. Soc— 1911,No. XXVIII. 28 



