STENEOSAUKUS. 



103 



a remnant of the diapophysial process (tubercle, d. ?), and this was perhaps united by a 

 ligament with the small diapopbysis of the axis (text-fig. 34, d.). If this bone is not 

 the rib of the axis, then even in the nearly complete skeletons of St. leedsi (R. 3806) 

 and St. durobrivensis (R. 3701) there is no other bone that can be assigned to this 

 position. 



The ribs of the succeeding cervicals (text-fig. 39, C-E) are of the normal Crocodilian 

 type — that is, each consists of a body lying nearly parallel with the long axis of the 

 vertebral column and bearing well-developed diapophysial and parapophysial processes 

 for union with the vertebra. The body of the rib is convex externally and concave 

 internally ; the anterior limb terminates in a blunt point, the posterior end is much 

 sharper ; the upper surface of the posterior limb is concave and fits against the lower 



Text-fisr. 39. 



Kibs of Steneosaurus durobrivensis : A, left rib of atlas ; B, ? left rib of axis ; C, outer side of middle right 

 cervical rib ; D, inner side of middle right cervical rib ; E, inner side of posterior left cervical rib ; 

 F. anterior right dorsal rib; G, middle right dorsal rib; H, posterior right dorsal rib. (B. 3701, 

 £ nat. size.) 



d., diapophysial process (tubercle) ; p., parapophysial process (head).] 



surface of the anterior limb of the rib behind. The diapophysial process (d.) is longer 

 than the parapophysial and terminates at its upper end in an elongated oval facer ■ 

 the shorter parapophysial process (p.) also terminates in an articular facet, which i 

 the anterior cervicals is wider than that of the diapophysis. Towards the back of th 

 neck the anterior limb of the rib widens and shortens, while the posterior length 

 and thickens and assumes the form of the dorsal ribs ; in the last cervical (text-flo-. 39. ]■]) 

 the anterior limb is merely a sharp flange on its anterior border. 



In the ribs of the most anterior dorsal region (text-fig. 39, F), the diapophysial (d.), 

 and parapophysial surfaces (p.) are still borne on distinct processes, that for the 



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