164 



PEOFESSOR OWEN ON THE GENUS DINOKNIS. 



The preaxial surface has its vertical extent not so inferior to the transverse as in 

 Struthio. 



The pleurapophysis articulates with a small shallow pit on a very short parapophysis ; 

 the 'head' is supported on a neck 1| inch long, and slender in proportion to the 

 body and tubercular process, which is sent oiF at an angle of 45' with the neck ; it 

 terminates by a smooth round tubercle, fitting a corresponding pit on the lower surface 



SIXTEENTH VERTEBEA (' 1st dorsal,' | nat. size). 



Fig.26. 



Eig. 25, 



Fig. 25, neural aspect, 



Fig. 26, lateral aspect. 



of the diapophysis, which it thus underprops. The body of the rib is flattened, 1 inch 

 ■3 lines broad at the divergence of the cervical and tubercular branches ; it is slightly 

 curved inward and forward, and gradually terminates in a point. No haemapophysis 

 (sternal rib) is developed in the sixteenth (1st dorsal) vertebra of Dinornis maximus. 



In the first dorsal vertebra of B. elephantopus the hypapophysis is more central in 

 position, more tuberous, less compressed, with a shorter base ; in other words, retaining 

 more of the character of that process in the last cervical. 



The seventeenth vertebra, answering to the twentieth or third dorsal in the Ostrich, 

 and repeating the character of the hypapophysis in the first dorsal, exemplifies also the 

 difference of being the first of the vertebral series, traced from the skull, in which the 

 segment, or osteocomma, is completed by a perfect hsemal arch. 



