Geological Society. 239 



EXPLANATION OF PLATE III. 



Fit/. 1. Glypho&toma glabriplicalum (twice nat. size). 

 Fig. 2. Drillia solicitata (twice nat. size). 

 Fig. 3. Mangilia osumiensis (3| times nat. size). 

 Fig. 4. Cythara quadrilineata (twice nat. size). 

 Fig. -5. Clathurella excellem (twice nat. size). 



Fig. 6. royi (2^ times nat. size). 



Fig. 7. Conus optimum (nat. size). 



Fig. 8. Chrysodomus acutispira (nat. size). 



Fig. 9. Mesalia exilis (nat. size). 



7'Y//. 10. Mitra marcue (twice nat. size). 



_F/</. 11. hidalgoi ( 1 1 times nat. size). 



Fig. 12. sadptispira (twice nat. size). 



Fig. 13. Tellina ewsculpta (nat. size). 

 i'Y/y. 14. Cardita kiiensis (nat. size). 

 .FVy. 15. regular is (nat. size). 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



February oth, 1913. — Dr. Aubrey Sfcrahan, F.R.S., President, 

 in the Chair. 



The following communication was read : — 



' On the Skeleton of Ornithodesmus latidens, an Ornithosaur 

 from tho Wealden Shales of Atherfield (Isle of Wight).' By 

 Reginald Walter Hooley, F.G.S. 



The bones were obtained from blocks recovered from the sea 

 after being washed from a huge fall of the Wealden Shales. 

 Portions of the skeleton missing in the Atherfield specimens are 

 supplemented by bones in the British Museum (Natural History), 

 No. R/176, upon which the late Prof. H. O. Seeley founded the 

 genus. There are remarkable peculiarities in the skull which 

 isolate it from all known families, such as the presence of a sixth 

 vacuity and a transposition of the jugal aud quadratojugal in regard 

 to the supra- and infra-temporal arcades. The jugal is excluded 

 from the upper arch, and the jugal and quadratojugal from tho 

 lower, which is formed entirely by the quadrate. The orbits are 

 placed far back in the skull, and the quadrate articulation is much 

 in front of them. The occiput is concave. Teeth occur only at 

 the extremity of the long muzzle ; they are set close together, and 

 those of the upper jaw interlock with those of the lower jaw. The 

 notarium, the humerus, the decussation of the ulna by the radius. 

 the sternum, and femur all show divergence from other types. 



