Ornithosaur'ian Genus Oriiithocheirus. 539 



Ornithocheirus difti (Mautell). Portions of humerus. 

 'iMedals of Creation,' vol. ii. (1844) p. 806, woodcut 149. 



Ornithocheirus curtus (Owen). Distal end of tibia. 

 Rep. l.ias Form. (Mon. Pal. Soc. 1870) pt. ii, p. 62, pi. xix. figs. 8, 9. 



Ornithocheirus diomedius (Owen). Distal end of ulnar 

 metacarpal. 

 Brit. Foss. Mam. and Birds (1846), p. 545, woodcut 230. 



Ornithocheirus nahilis (Owen). Portion of wing-phalange, 



? ulua. 



Rep. Lias Form. (Mon. Pal. Soc. 1870) pt. ii. descr. to pi. xix. fig. 10. 



These species, founded on fragments of bones, must for 

 the present remain in the genus Ornithocheirus, but for no 

 other reason than that they have been placed there, for the 

 characters of the bones belonging to the genus Ornithocheiras 

 are absolutely unknown. 



The Vertebral Column. 



In regard to the bones of the vertebral column, there is 

 not much in the Cambridge Greensaud specimens, by reason 

 of their fragmentary and Avorn condition aiul tbeir non- 

 association with parts known to belong to given species, to 

 help one in classification. Some of the cervicals are fairly 

 perfect. Seeley * denotes two groups : — 



(I.) Narrow neural arch with high neural spine, pneu- 

 matic foramen oblique. Ventral face of centrum 

 oblong and flattened. 



He gives as example that figured by Owen f as belonging 

 to Pterodactylus sinius. 



(II.) Wide neural arch, pneumatic foramen horizontal. 

 Side of centrum makes a right angle with the 

 base (p. ti8). Ventral surface convex. 



Example given, Fterodactijlus simus (Owen) J. 



* H. G. Seeley, ' Oiuithosauria,' 1870, p. 06. 



t R. Oweu, Rep. Cret. Form. (Mon. I'al. Soc. 18G1), Suppl. iii. pi. ii. 

 fig. 4. 



X Id. ibid. (Men. I'al. Soc. 1859), Suppl. i. pi. ii. fig. 1. 



