454 PEOCEEDINaS OF THE GEOLOGICAL SOCIETY. [DeC. 15, 



into the sandstone, it was worth some trouble to work out this bone 

 completely, and having succeeded, by dint of careful chiselling, in 

 removing a considerable quantity of superiacumbent matrix without 

 damage to the fossil, I was rewarded by the view of the nearly 

 entire ventral face of a coracoid bone, of a form very imHke what 

 might have been anticipated. Fox this bone, far from having the 

 transversely elongated form more or less constricted in. the middle, 

 which is exhibited by the corresponding part in all the true Croco- 

 dilia with which I am acquainted, whether mesozoic, cainozoic, or 

 recent, is almost elliptical in outline, and the long axis of the ellipse, 

 which is nearly parallel with the middle line, is to the short trans^ 

 verse axis as 6 to about 4. The articular surface for the humerus 

 is crushed and partly broken away, and a part of the anterior ex- 

 ternal edge is incomplete. The posterior edge of the bone presents 

 a deep excavation close to the articular end ; and, if two lines were 

 drawn, one longitudinally through the deepest part of the notch, 

 and the other transversely through the greatest transverse diameter 

 of the bone, they would cut one another in the midst of a circular 

 foramen, which corresponds with the coracoid foramen of Crocodiles 

 and many Lizards. I find no coracoid so similar to this as that of 

 Hl/lceosaurus"^, 



Jaw and Teeth, — The only remaining fossil which bears strongly 

 upon the question of the affinities of Stagonolejois is the impression 

 of a fragment of what I conceive to be the lower jaw, exhibiting the 

 remains of some eight or nine alveoli. The impressions of the teeth 

 contained in four of these, situated near the anterior end of the frag- 

 ment (which may or may not have been its natural termination), are. 

 tolerably perfect. The third tooth is the largest, though, judging 

 by its alveolus, the fourth, which is wanting, must have been larger 

 than even the third. The second tooth is emerging from the jaw, 

 not more than half its length being visible beyond the alveolar edge. 



The impression of the surface of the jaw is, though imperfect, an 

 inch and a half deep in some places, while the longest tooth projects 

 two and a quarter inches beyond the alveolar margin ; so that this 

 tooth was probably at least three inches long, while its greatest 

 transverse diameter amounts to very little less than five-eighths of 

 an inch. 



The upper third of each tooth is slightly recurved, and the apex 

 appears to have been lancet-shaped when young, but more obtuse 

 and rounded afterwards. At the apex and for some distance below 

 it (half an inch in the longest or fourth tooth) the surface of the 

 tooth is smooth and polished, but further down numerous longi- 

 tudinal ridges, with rounded surfaces, separated by very narrow 

 grooves, make their appearance, and increase slightly in strength 

 down to the alveolar margin. As might be expected from the sub- 

 cylindrical figure of the tooth, the ridges do not increase in width 

 towards its root. 



The teeth appear to have had broad anterior and narrow poste- 



* See concluding Note, p. 459. 



