44 



tlie OS hyoides of the gemis Catodon. 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... 



OP THE EAR. 



As in the true sperm whale and dolphins the small bones of 

 the ear are confluent into one stony piece, which is suspended in 

 a cavity of the head close to the temporal bone. It may be 

 divided into three parts, viz., the labyrinth, tympanum, and the 

 somewhat prismatic base from Avhich 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 Oatodon, 

 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 longi- 

 tudinal 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. 



