44 



The styloidean processes are sub -cylindrical pieces, thicker at 

 each extremity. 



Length of middle piece 



Width of ditto 



Greatest thickness . . . , 



Length of a horn 



Width of ditto 



Length of styloidean . 



Inches. 



H 



4 



IS 



3 



2^ 

 4 



or THE EAR. 



As in the true sperm whale and dolphins the small bones 

 of the ear are confluent into one stony piece, which is sus- 

 pended in a cavity of the head close to the temporal bone. 

 It may be divided into three parts, viz. : the labyrinth, tym- 

 panum, and the somewhat prismatic base from which they 

 both spring as from a fibrous root. The larger portion 

 of the labyrinth has externally six points, and the 

 other portion, which is spherical in Catodon, is here oval 

 as in dolphins. None of the four holes which almost in a line 

 separate the oval part of the labyrinth from the larger portion, 

 are here pierced in a cavity distinct from any of the others. In 

 dolphins, on the other hand, there is one large semicircular 

 hole in which three smaller ones are pierced, leaving the 

 fourth hole outside something as in Catodon^ only still further 

 removed from the structure of the ear in our animal. The 

 tympanum resembles the shell called a cone with a wide 

 longitudinal mouth, and in other respects the ear resembles 

 that of the Catodon more than the ear of the dolphin. 



Having now given a pretty full description of the head 

 of this small whale, it seems high time for us to consider the 

 name that ought to be given to it. 



