PKOCEEDINGS OF THE GEOLOGICAL SOCIETY. I9I 



which are regarded as probably well established. Eight of these are 

 referred to the Cetiosauria, thirteen to the Megalosauria, and four 

 to the Aristosuchia or Compsognatha. 



2. "Mesosauria from South Africa." By Prof. H. G. Seeley, 

 F.E.S., F.G.S. 



3. " On a new E,eptile from Welte Yreden, Eunotosaurus afrwanm 

 (Seeley)." By Prof. H. G. Seeley, F.E.S., F.G.S. 



Discussion. 



The President observed that there could be no question as to the 

 great value of these papers, the first of which especially was the 

 outcome of years of experience and study on the part of the 

 Author. It was only right to remark that the paper on Saurischia 

 was received by the officers of the Society early in April. Since 

 that date Prof. Marsh, in his Notes on Triassic Dinosauria (which 

 did not appear till May 24th), had published, as regards Zandodon, 

 conclusions similar to those at which the Author (Prof. Seeley) had 

 already arrived. 



Mr. E. T. Newton also spoke. 



Prof. Seeley drew attention to a photograph of Hortalotarsus, a 

 reproduction of a sketch made at Barkly East, before the original 

 specimen had been destroyed in the process of blasting the rock. 



4. " The Dioritic Picrite of White Hause and Great Cockup." 

 By J. Postlethwaite, Esq., E.G.S. 



5. " On the Structure of the American Pteraspidian, Palceaspis 

 (Claypole), with Remarks on the Family." By Prof. E. W. Clay- 

 pole, B.A., D.Sc, F.G.S. 



6. " Contributions to the Geology of the Wengen and St. Cassian 

 Strata in Southern Tyrol." By Miss Maria M. Ogilvie, B.Sc. 

 (Communicated by Prof. C. Lapworth, LL.D., F.R.S., F.G.S.) 



7. " Notes on some New and Little-known Species of Carboni- 

 ferous Murchisonia." By Miss Jane Donald. (Communicated by 

 J. G. Goodchild, Esq., F.G.S.) 



8. "Notes from a Geological Survey in Nicaragua." By J. 

 Crawford, Esq., Geological Surveyor to the Nicaraguan Government. 

 (Communicated by Prof. J. Prestwich, LL.D., F.R.S., F.G.S.) 



[Abstract.] 



The Author states that Nicaragua, geologically considered, can be 

 divided, from north to south, into five zones, differing from one 

 another in lithological, miueralogical, and structural characters. 



The first division embraces the central mountainous parts, and 

 contains Laurentian, Taconian, Cambrian, and Silurian rocks, also 

 Devonian rocks unconformable to the last. The second division, 

 parallel to that just named, and extending to within a hundred 

 miles of the Caribbean Sea, contains sediments of Carboniferous, 



