Orniihosaiiriati Genus Oinlthoclielius. 541 



centrums flat and 3 to 7 convex. In specimen J. c. 4, 3, 

 which consists of three vertebraj^ the bases of two transverse 

 ribs are preserved. 



The Caudal Vertebra. 



The examples determined as caudal vertebrae by Seclcy in 

 * Ornitho>auria ^ he later "^ believed to be cervicals. Some 

 arc doubtless centrums of cervicals. The absence of trans- 

 verse processes and their amphiplatyan nature bring them 

 cL,se to Ornithostoma {Pteratiodoti). 



The Scapula aiid Coracoid. 



These bones may be separated into two groups. One of 

 these, typified by specimens J, a. 3, was figured by Owen t- 

 This example is very interesting, because it exhibits on the 

 inner side of the scapular arch tlie bar of bone bracing the 

 scapula and coracoid, and enclosing a foramen similar to 

 that mentioned by Prof. Williston % as found in Ornithostoma 

 ( i^teranodon) and Nijctosaurus. There M'ould not seem to be 

 further proof required that this type of scapula-coracoid 

 belongs to the toothless English genus Ornithostoma. The 

 coraco-scapular suture is oljlique to the long axis of the 

 glenoid cavity. The head of the coracoid is not so globular 

 as that typified by J. c. 4, 18^ 6. This specimen^ figured by 

 Seeley §, is characterized by the absence of the bar of bone, 

 interior to the anchylosed humeral extremities of these bones. 

 Both these two types are easily differentiated from Ornitho- 

 desmus latidens by the diagonal direction of the line of 

 anchylosis of the scapula with the coracoid across the glenoid 

 articulation, which in the Litter is horizontal. The type, 

 J. c. 4, 18, 6, is very nearly similar in form to the latter, 

 and both are alike in the non-presence of the inner bar of 

 bone. 



The Humerus. 



Seeley || mentions fifty specimens of this bone. J. a. 8, 1 

 may be dismissed as useless. It is |)art of a large limb- 

 bune, from its size more probably Dinosaurian, for it is 



* H. G. Seeley, Quart. Journ. Geol. Soc. 1875. 



t R. Owen, Cret. Form. Rep. (Mon. Pal. Soc. 1859), Suppl. i. p. Ill, 

 fig. 1. 



\ S. W. Williston, Kansas Univ. Quart. 1897, p. 43 ; and Field Cul. 

 iJuy. I'ub. 78, geo. ser. vol. iii. no. 3, ]ip. 140-141. 



§ II. G. Seeley, ' Ornitliosauria,' 1870, pi. i. lig. 10. 



II Id. ibid. p. y8. 



