136 Geological Society. 



texture usually found in Dinosauria, and not that peculiar to Ccelu- 

 rus. The mode of attachment of the ribs was also different. The 

 sacrum of Coelurus was unknown,' but was probably very different 

 from that of Aristosuelms. In the latter the transverse processes 

 or sacral ribs were given oflf from each individual vertebra, as in 

 certain American forms, and not, as in Iguanodon, Hylceosaurus, 

 Megalosaurus, &c., from, the junction between two centrums. 



The five sacral vertebra of the fossil and their apophyses were 

 then separately described in detail, and also an associated fragmen- 

 tary caudal vertebra ; and the conclusion was expressed that Aristo- 

 suchusw&s a Dinosaur nearly related to certain imperfectly described 

 American types, such as AUosaurus. 



3. ** On Patricosaurus merocratus, Seeley, a Lizard from the 

 Cambridge Greensand, preserved in the Woodwardian Museum of 

 the University of Cambridge." By Prof. H. G. Seeley, F.R.S., 

 F.G.S. 



No Lacertilian has hitherto been described from the Cambridge 

 Greensand. The only remains of Lizards known to the author as 

 having been derived from that bed consisted of the two bones now 

 described, the proximal end of a femur, and a sacral vertebra with 

 the processes broken away. The former exceeded in size the cor- 

 responding bone of the largest living Monitor, and diflfered from 

 the femora in all recent Lizards in so many respects as to indicate 

 subordinal distinction. The vertebra was not found with the 

 femur, and may have belonged to a diflFereut species ; but there 

 being nothing in the characteristics of the two bones inconsistent 

 with their having belonged to one specific type, both were fully de- 

 scribed as types of a new genus and species. 



4. " On BeteromcJius valdensis, Seeley, a procoelian Crocodile from 

 the Hastings Sands of Hastings." By Prof. H. G. Seeley, F.R.S., 

 F.G.S. 



An ironstone nodule from the Hastings Sands was acquired by 

 the British Museum from Dr. Mantell's collection. The specimen 

 measured 10 centimetres by h, and displayed on its water-worn sur- 

 face several proccelian vertebrae of a small Crocodilian, together 

 with some other bones, perhaps belonging to a different reptile. 

 These other bones appeared to comprise portions of a skull with 

 peculiarities not hitherto recognized in proccelian Crocodiles, and a 

 pubis and ischium exhibiting distinct Lacertilian characters, and of 

 comparatively very small size, but still situated in proximity to the 

 sacral vertebrae. 



The vertebrae were described in detail in the paper, and referred 

 to a new genus and species. They included one late cervical ver- 

 tebra, eight dorsal, and two which might be considered as sacral. 

 All appeared to be mature, and were more completely ossified than 

 the same bones in living Crocodiles. The body of each centrum was 



