72 CETACEA. 



baleen can live on large fishes ; but the extreme narrowness of the 

 gullet (that of B. ma.vimus barely allowed the passage of the closed 

 human hand, and that of B. mhilmus was certainly narrower than 

 that of an ordinarj'-sized cow), added to the want of teeth, and the 

 want of proper aiithcnticated information on the subject, are strong 

 arguments in favour of the hjiwthesis that they do not. — Knox, Cat. 

 Prej}. Whale, 16. 



Professor Eschricht proposes to divide the \VTiales into groups 

 according to their food, as given at p. 65. I suspect that they vary 

 their food to a considerable extent at different periods of the year 

 and under different circumstances. 



Professor Eschricht (in Fordhandl. Skand. Naturf. Kiobenh. 1847, 

 8vo, 1849, p. 103) has published a paper on the geographical distri- 

 bution of some of the Northern Whales, with a map, by which it 

 appears that Balcena Myst'wetus in Baffin's Bay lives in fi'om latitude 

 65° to 69° in December to June, and in July and August ascends 

 to 77°. The Finnolic lives in lat. 76° in the sirmmer, on the coast of 

 North Greenland, and in lat. 69° in South Greenland. The KeporTcalc 

 in lat. 76° in North Greenland, and in lat. 62° in South Greenland. 



The rarity of theu' occurrence, the difficulty of naturalists ex- 

 amining them when they do occur, and especially of comparing them 

 with other specimens, explain why the Whalebone Whales have 

 been so imperfectly known ; and, when observed, the specimens are 

 so large that it is almost impossible for the eye of the naturalist to 

 take them in as a whole, and to comiiare the parts in detail. 



The allied species are so alike externally, that naturalists and 

 others who have had the opportunity of examinmg them have been 

 inclined to regard the different specimens observed as only states of 

 growth of the same species ; and, for the same reason, the specimens 

 which have been observed in different parts of the world have been 

 regarded as alike ; and thus the belief has become general that the 

 species of Wlialebone Whales have a very extended geographical 

 distribution. 



The examination and comparison of the few skeletons that have 

 been collected have shown that there are many more species than 

 has been generally supposed, and seem to lead to the conclusion 

 that each species of Whalebone WTiale has only a comparatively 

 limited geographical range ; and the observation of whales seems to 

 make it probable that some of them make periodical migrations 

 within these limits. 



The study of the subject, and especially of the bones that have 

 been collected, has led me to the following conclusions : — 



1. That, though the adult ^^Hialebone "WTiales have a large head 

 compared with the size of the body, the head of the foetal specimen 

 Is short, and that it increases in size, and especially in length, much 

 more rapitUy than the rest of the body. This is very a])parent in 

 the liight or Greenland Whale, where the head of the adult is two- 

 fifths, while that of the new-born is only two-sevenths of the entire 

 lengtli of the animal. These differences are shown by Eschricht in 

 his figures. The head of the new-born and of the adidt Cape AVTiale- 



