CETACEA. 51 



The lower jaw appears to increase in length in front, for in the 

 older specimens the symphysis is more, and in the younger ones 

 less, than half the entire length of the jaw. 



e. Ear bones. Presented by H. H. Russell, Esq. 



f, g. Teeth, various. 

 h. Section of a tooth. 



There is the skull of a very young specimen, probably a foetus 

 of this animal, in the Museum of the College of Surgeons : the 

 bones are of a very soft structure. The following are its mea- 

 surements : 



Length, entire 32 inches. 



Length of nose 20 



Length of lower jaw 28 



Length of symphysis 9*6 



Width at notch of nose 12'6 



Width of condyles apart 16'6 



Camper (Cetac. 1. 17, 20-22, from the church of Scherclinge, 

 t. 18, 19, 27, Mus. Paris) figured the skull of this whale. He 

 represents the nose of the skull as nearly twice and a half as long 

 as the width at the notch. 



The following table exhibits the measurements of the lower jaw 

 of 9 specimens, all taken on the coast east of America. 



No. 



1. 

 2. 

 3. 

 4. 

 5. 

 6. 

 7. 



8. 

 9. 



Jackson, Boston Journ. N. H. v. 153. 



The young is quite black ; remarkably smooth and elastic, like 

 India rubber ; from a line with the anterior extremity of the head 

 to the top of the tail, 1 6 feet ; to the rudimentary dorsal fin, 9 feet ; 

 to the anterior fin, about 4 feet ; to the vent, 10 feet 2 inches ; 

 to the eyes, 3 feet 2 inches ; to the external orifice of ears (which 

 was about the size of a goose-quill), 3 feet 8 inches ; to the angle 

 of the mouth, 2 feet 10 inches ; vertical diameter of the head, 

 just in front of the opening of the mouth, 2 feet 10 inches ; 



c2 



