44 CERVICAL VERTEBR.-E. [chap. iv. 



grown (see Fig. 5, p. 20) ; that of the axis is still distinct 

 in an adult Ornit/iorhyjic/ms. Though in this respect they 

 present an approximation to the Sauropsida (Reptiles and 

 Birds), they differ from .that group, inasmuch as there is not 

 a gradual transition from these autogenous transverse pro- 

 cesses of the neck (or cervical ribs, as they may be con- 

 sidered) into the thoracic ribs, for in the seventh vertebra 

 the costal element is much smaller than in the others, 

 indicative of a very marked separation of neck from thorax, 

 not seen in the Sauropsida 



