/So 



DEPTHS OF THE OCEAN 



The cachalot or sperm - whale {Physeter inacrocephalus, 

 F^g- 572) and the bottle-nose {^Hyperoodon diodon) feed mainly 

 on squids.^ 



Howard Clark- has published an interesting chart recording 

 the various whaling areas, in which he has separated areas 

 fished in 1887 from areas previously fished but then abandoned. 

 The whales fished in various areas are denoted by letters : — 

 B. = Greenland whale. 

 R. = Other Right whales (Balsena). 

 F. = Fin-whales (Balsenoptera). 

 H. = Humpback whales (Megaptera). 

 S. = Cachalots or Sperm-whales. 



Fig. 571. 

 The Humpback [Megaptera boops). (From G. O. S;irs. ) 



Cachalot or Sperm-whale {Physeter inacrocephalus). (From drawing in the Bergen Museum.) 



The Chart (Fig. 573) gives his records from the Atlantic, and 

 at the same time the temperature at 100 metres has been 

 entered, from Fig. 312, p. 445, and from Schott's report on the 

 "Valdivia" Expedition. The dense hatching shows areas 

 where whales were fished in 1887, the open hatching areas then 

 abandoned. In northern boreal waters, north of the isotherm 

 of 10' C, only or mainly the Greenland whale, fin-whales, and 

 humpbacks are found, the right whale of the North Atlantic 

 (north-caper or Biscayan whale, Balcsna biscayensis, Fig. 574) 

 being a rare visitor. In antarctic waters, where the thermal 



^ See Turner, /onrn. Anat. and Phys., vol. xxvi. 

 - 7^he Fisheries and Fishery Industries of tlie United States, Section V., Washington, 1887. 



