Geological Sociefi/, 265 



S. Bocagci. 6". prafensu^. 



lutei-parietal, lenfrth 3-2 2-4 



bivadth 9-4 90 



Palate, length 14-2 12-1 



Diastema 7*3 6-3 



Length of palatine foramina .... 5"7 4"8 



Length of upper molar series .... 4*4 3 8 



The specimen here described and measured was obtained 

 at Caconda by M. Ancliieta. 



The second species described by Peters, S. Krehsi^, from 

 Caffraria, shows no approximation to 6'. Bocagei and is very 

 doubtfully separable from S. pratennis. 



PllOCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



June 22nd, 1892.— W. H. Hudlcston, Esq., M.A., F.Il.S,, 

 President, iu the Chair. 



The following communication was read : — 



*' Contribution to a Knowledge of the Saurischia of Europe and 

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



The Saurischia are defined as terrestrial uuguiculate 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 Cetiosauriau pelvis has been figured in the Quart. Journ. 

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

 saunts, Stfej^fosjiomJi/Jus, and Compsognathns. 



The characters of the skull are eN-idenced by description of the 

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

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

 tions it closely resembles Ceratosaurus. and the corres})onding region 

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

 nerves are described, and contrasted with those of Ctratosauriis. 



The skull in Cetiosauria, known from the American type Diplo- 

 docus, is identified in the European genus Belodon, which is re- 

 garded as a primitive Cetiosaurian. 



Pait 2 discusses the pelvis of Belodon, restored from specimens 

 in the British Museum, and regarded as Cetiosaurian. A restora- 

 tion of the shoulder-girdle is made, and found to resemble that in Ich- 

 thyosaurs, Anomodonts, and Dinosauria. The vertebra; in form and 



* Saug Mossamb. p. 105 (1852). 

 Ann. & Mag. N. Hist. Ser. 6. Vol. x. 18 



