122 



Baleen, black, short, and very broad at the base. 



Inhab. North Sea ; ascending rivers. 



The beak of the skull is of great breadth to half its length, whence 

 it contracts towards the tip, not gradually tapering from the base, as 

 in the preceding species. This peculiarity, and the wide cheek-bones, 

 the sternum of an irregular oval, and two additional caudal vertebrae, 

 form the distinguishing features between the present animal and the 

 Kazorback. 



The colour of Sibbald's finner, the grey fin-whale of Turner, is of a 

 deep brown, verging upon green ; in size it equals any known species 

 of the sub-order. It is seldom taken by the whalers, because the 

 inferior quality of the whalebone and small yield of oil are not com- 

 mensurate with the risk of the capture. 



Dr. Gray considers that the Great Northern Rorqual, figured in 

 Jardine's Naturalist's Library, and so ably described by Dr. Knox, 

 belongs to the above species, the Physalus (Cuvierus) Sibbaldii. 



Of the Balsenoptera Carolina?, placed in the synonyms, Mr. Malm 

 says that it bears on the skin the usual number of cirripeds, but 

 within the body an intestinal worm was found. of quite a new form, to 

 which he has given the name of Echinorhynchus 1 brevicollis 2 . 



PHYSALUS PATACHONICUS, Burmeister. The Buenos Ayres Finner. 

 Synonyms Balffnoptera patachonica, Burmeister, Van Beneden. 



Physalus patachonicus, Gray, S. & W., p. 374, Suppl., p. 53. 

 PJiy solus australis, Gray, ? 1850. 

 Balcena australis, ? Desmoulins. 



Baleen black throughout. 



Inhab. Southern and eastern coasts of South America. 



This whale, of which a portion of the skeleton is only known, is dis- 

 tinguished from the Physalus antiquorum, by characters very similar to 

 those exhibited by the Phys. Sibbaldii, namely, by the great breadth of 

 the face of the skull, continued to half its length before it narrows to 

 the tip of the muzzle, and by the lateral rings of the second, third, and 

 fourth of the cervical vertebrae being shorter than the diameter of the 

 body of the vertebrae. 



Seeing that the sternum, an important part, is absent, it is difficult 

 to say how this whale differs in its anatomy from the Phys. (Cuvierius) 

 Sibbaldii. 



However this may be, it appears to represent in the Southern Hemi- 

 sphere, by its size and peculiar osseous structure, the Physalus Sibbaldii 

 of the Arctic Seas. 



1 ^XLVOS, hedgehog, and fivyKos, beak. 



2 JBrevis, short, and collum, the neck. These worms have a proboscis armed with 

 little bent hooks, by which they cling to the intestines, and frequently penetrate 

 through them. 



