1 88 PEOCEEDINGS OP THE GEOLOGICAL SOCIETY. 



Microscopic preparations of specimens of Trinidad Rocks, exhibited 

 by Dr. G. J. Hinde, F.G.S. 



Marine Possils from the Lower Bagshot Sands, Goldsworthy, near 

 Woking, exhibited by E,. S. Herries, Esq., F.G.S; 



Photographs of recent Fumaroles in 'New Lavas of Vesuvius, 

 photographed and exhibited by Dr. H. J. Johnston-Lavis, F.G.S. 



June 22nd, 1892. 

 W. H. HuDLESToiir, Esq., M.A., F.R.S., President, in the Chair. 



James Fenn Clark, Esq., Clent House, Beauchamp Square, 

 Leamington, was elected a Fellow of the Society. 



The following names of Fellows of the Society were read out for 

 the second time, in conformity with the Bye-laws, Section YI. Art. 5, 

 in consequence of the non-payment of arrears of contributions : — 



B. N". Boyd, Esq.; J. S. Ckawford, Esq.; E. Easton, Esq.; 

 M. W. B. Ffolkes, Esq. ; H. Gleitny, Esq. ; D. G. H. Gordon", Esq. ; 

 Bev. G. W. James ; C. Lane, Esq. ; J. Maetin, Esq. ; Mirza 

 Mehdy Khan ; , J. C. B. P. Seaver, Esq. ; A. Simons, Esq. ; 

 J. Stirling, Esq. ; H. Stopes, Esq. ; and the Rev. H. A. Williams. 



The List of Donations to the Library was read. 



The following communications were read : — 



1. " Contribution to a Knowledge of the Saurischia of Europe and 

 Africa." By Prof. H. G. Seeley, F.R.S., F.G.S. 



[Withdrawn.] 



The Saurischia are defined as terrestrial unguiculate Ornitho- 

 morpha, with pubic bones directed downward, inward, and forward 

 to meet in a ventral union. The forms of the pelvic bones vary 

 with the length of the limbs, the acetabulum becoming perforate, 

 the ilium more extended, the pubis and ischium more slender, and 

 the sacrum narrower as the limb-bones elongate. The order is re- 

 garded as including the Cetiosauria, Megalosauria, and Aristosuchia 

 or Compsognatha. 



The Cetiosaurian pelvis has been figured in the Quart. Journ. 

 Geol. Soc. ; and a restoration is now given of the pelvis in Megalo- 

 saurus, Streptospondylus^ and Compsognathus. 



The characters of the skull are evidenced by description of the 

 hinder part of the skull in Megalosaurus found at Kirtlington, and 

 preserved in the Oxford University Museum. In form and propor- 

 tions it closely resembles Ceratosaurus, and the corresponding region 

 of the head in Jurassic Ornithosauria. The brain-cavity and cranial 

 nerves are described, and contrasted with those of Ceratosaurus. 



