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part two apophyses by which it is suspended by cartilages to the 

 styloideans. On each side, more particuharly iu young speci- 

 mens, the two horns of the crescent are separated by a suture 

 from the centre piece. In our Sydney whale, which is com- 

 paratively a young specimen, the central bone of the os Jii/oides 

 is heart-shaped, with the point of the heart notched, so as to give 

 off the two short apophyses to which the styloideans are attached 

 by cartilage. It is also keeled in the middle behind, and con- 

 cave within. On each side we see a flat oval bone, joined by a 

 suture to this middle bone. In some Getacea, these bones, 

 which form the horns of the crescent, are said always to remain 

 in the state of cartilage. The styloideans, in our whale, are 

 insulated slender prismatic bones, somewhat rounded at the 

 points. Cuvier has figured an os Tiyoides (O.E. pi. 22G. fig. 15), 

 very like to the one just described, and which he supposes to 

 liave belonged to the Audierne Cachalot. Tlie dimensions of 

 the OS liy aides, in our specimen, are as follows : — 



Middle length of middle piece 



Greatest breadth of ditto 



Breadth of ditto between the horns 



Length of a horn of the crescent 



Greatest breadth of ditto 



Length of a styloidean 



Greatest diameter of ditto 



OF THE EAR. 



Camper has figured the bone of the ear in the Northern 

 Sperm Whale, but I have not been able to refer to his figure, 

 and to compare it with the ear of our animal. Cuvier never 

 saw this bone of the sperm whale. In the Sydney specimen, 



