51 



To judge from the articulating surfaces, there are about 

 thirteen V bones in this animal. Of these, however, only- 

 seven have been found, the first of which belongs to the 

 twenty-fifth vertebra. The following table will express their 

 dimensions, and also the particular vertebrae to which they 

 were attached by cartilaginous ligaments : — 



OF THE REBS. 



The ribs are not very round as in Catodon, but flattish and 

 often somewhat angular. The animal is thus more com- 

 pressed, that is, narrower and deeper in proportion than 

 Catodon. Instead of ten pair of ribs, as in the true sperm 

 whale, the Euphysetes has no less than fourteen pairs, of which 

 the last pair are merely minute rudimentary bones floating in 

 the side of the animal and entirely disjoined from the vertebral 

 axis. The first rib, which is broad and flat, is bent in the 

 middle almost at right angles, and has but one articulating 

 surface ; that is, to the transverse process of the first dorsal 

 vertebra. The seven following pairs have each two articu- 

 lating surfaces for each consecutive two of the first seven 

 vertebrae, and the next five pairs have only one articulating 

 surface for each rib. All the ribs are more or less arched, 



