ADDITIONS ADD COREECTIONS. 



389 



Oatodon lately received by the Eoyal CoUege of Surgeons, whicli I 

 hope will shortly be described by Mr. Plover, the energetic Curator 

 of their Museum, who, in his late paper on the BalcBnidce, has shown 

 how well he can describe and determine the species of whales." — 

 Gray, P. Z. S. 1865, 439. 



Mr. Krefft seems to have changed his mind on this subject ; for in 

 a letter just received, containing further remarks on these photo- 

 graphs, and some additional ones, he names the mass of vertebrae as 

 belonging to Oatodon australis. 



Meganeuron Erefftii? 



" The second and other cervical vertebrae are all united together 

 into one mass, anchylosed by their bodies, lateral processes, and neural 

 arches. The neural arches form a triangular mass, which is strongly 

 keeled on the central line; and the keel is stronger and produced 

 into an acute point at the hinder end (figs. 96, 97). 



Oatodon (Meganeuron) Krefiitii, Gray, P. Z. S. 1865, 440. 



Fig. 96. 



Hind view of cervical vertebrae of ^ 



australis. 



■on Krefftii? or Oatodon 



" The lateral processes of the second, third, and fourth vertebrae are ■ 

 produced and united into a broad, thick, angular process, which is 

 expanded at the side, giving the united mass a rhombic appearance, 

 the width of the side being about one-fourth more than the height 

 of the mass. 



" There is a tubercle, which is most probably the end of the lower 

 lateral process of one of the anterior cervical vertebrae, at the lower 

 part of the hinder side of the front lateral expansion. 



