Figure 157. Lower jaw of a Sperm Whale on board the Willem Barendsz. {rhütugraph. 

 Dr W. Vervoort, Ley den.) 



Figure 158. Skull of a Sperm Whale. This 



cuttlefish eater has well-developed teeth in 



the lower jaw only. {Van Beneden and 



Gervais, 1880.) 



Figure ijjg. Lower jaw of a Sperm Whale. Note to what extent 



the two halves of the jaw have become fused. {Van Beneden and 



Gervais, 1880. 



