v.] 



CETACEA. 



39 



and very wide, oblong wing-like transverse processes directed 

 somewhat backwards, and with an oval perforation near the 



Fig. 17. — Anterior surface of axis of common Fin V^"h.z\Q{Bala'noJ>terainjisculus), ^'.,. 

 o odontoid process. 



base. The other cervical vertebrae (Fig. 18) have similar 

 broad, very short bodies, small arches, without spines, and 

 very long transverse processes, composed of a slender upper 



Fig. 18. — Anterior surface of fourth cervical vertebra of the same animal, -,'«. az ante- 

 rior of zygapophysis ; t upper transverse process ; t' lower transverse process. 



and lower bar, widely separated at their bases, but united at 

 their extremities so as to enclose a very large space between 

 them. In the seventh the upper process only exists, and the 

 lower one is occasionally imperfect in the sixth.' In very 

 young animals these processes are formed only of cartilage ; 



^ Professor Turner has shown that, in a fatal Bahinoptera sihbaldii, 

 the inferior transverse process of the seventh is present in a cartilagi- 

 nous condition. (Journal of Anatomv and Physiology, May 1 871.) 



