390 



ADDITIONS AND COEBECTIONS. 



' ' The three hinder vertebrae have no distinct lower lateral processes ; 

 their place is only marked by three slight ridges on the lower edge 

 of the hinder side of the mass. The upper lateral processes of the 

 hinder cervical vertehrse are small, slender, forming a strap-like sec- 

 tion, rather tapering towards and truncated at the tips on the side 

 of the apertures for the passage of the nerves for the neural canal. 

 The neural canal is rather large, oblong transverse, the height being 

 about two-thirds of the width ; it is rather larger and higher behind. 



Fig. 97. 



Side view of the hinder side of the cervical vertebrae of Meganeuron 

 Krefftii ? or Catodon australis. 



" The hinder surface of the body of the last cervical vertebra is 

 oblong transverse, about two-thirds of the height of its width at the 

 widest part ; the lower edge is rounded and rathe'r angularly pro- 

 duced in the centre, and the upper margin transverse, with a slight 

 central depression; the surface is concave, with a central, linear, 

 perpendicular depression." — Gray, P. Z. S. 1865, 440-442. . 



Page 210, add to characters of Section II. : — 



The pectoral fin elongate, mhfalcate. The cavity on the crown of the head 

 ' situated backward, formed by the maxUlaries, and divided as it were into 

 two equal parts by a central bony ridge, which is more or less twisted 

 towards the right side of the head. Physeterina. 



The larger-headed genus Physeter has only been found in the 

 northern, and the shorter-headed genera Eogia and Euphysetes in 

 the southern hemisphere. 



