Mr. E. Wilson on the Rhcetics of Nottinghamshire. 149 



the ArdmUlan Series is of Oaradoe -Bala age. The Xewlands Series 

 answers to the Llandovery formation, of Murchison, containing 

 similar fossils and corresponding local breaks in the succession. 

 The Purple Shales of Penhill correspond in systematic position, 

 penological features, and fossils with the Tarannon : and the 

 Straiton Beds represent the lower division of the Wenlock. 



The development of the paheontological features of the several 

 zones of life in this succession, and the demonstration of their 

 correspondence with the zones already recognized in the synchronous 

 Lower Palaeozoic strata of lloffat, the Lake-District, .Scandinavia, 

 and elsewhere were reserved by the author for a second part of this 

 memoir. 



3. " Notes on the Annelida Tubicola of the Wenlock Shales, from 

 the Washings of Mr. G-eorge Maw, F.G.S."' By George Robert 

 Vine. Esq. 



4. "Description of part of the Femur of Notoiherium Ititchelli" 

 By Prof. Owen, C.B., F.R.S., P.G.S., &c. 



5. ;: On Helicopora latispiralis, a new spiral Fenestellid from 

 the Upper Silurian beds of Ohio. U.S." Bv E. W. Clavpole. Esq., 

 B.A., B.Sc. (Lond.), F.G.S. 



June 21.— J. W. Hulke, Esq., E.E.S., 

 President, in the Chair. 



The following communications were read: — 



1. " On Theeosjiondylus Homeri, a new Dinosaur from the 

 Hastings Sand, indicated bv the Sacrum and the Neural Canal of 

 the Sacral Region. "' By Prof. H. Or. Seeley, E.E.S., E.Ct.S. 



2. ' ; On the Dorsal Eegion of the Vertebral Column of a new 

 Dinosaur, indicating a new genus. Sphenospondylus, from the 

 Wealden of Brook in the Isle of Wight, preserved in the Wood- 

 wardian Museum of the University of Cambridge." Bv Prof. H. G. 

 Seeley, E.E.S., E.G-.S. 



3. " On Organic Remains from the Upper Permian Strata of 

 Kargalinsk in Eastern Russia." Bv W. H. Twelverrees. Esq., 

 F.G.S. 



4. -The Rhsetics of Nottinghamshire.'" Bv E. Wilson, Esq., 

 F.G.S. 



During the last few years several sections of the Rhaetic beds, in 

 addition to those already known near Gainsborough and Newark, 

 have been exposed in making rail way- cuttings. These were described 

 by the author. The beds usually assigned to the Rhaetie consist of : — 

 Lower Rhsetic, greyish or greenish marls : Middle or Avieula-con- 

 torta series ; and "Upper Eha?tic (white Lias), a series of variable 

 shales and light-coloured limestones. The author pointed out that in 

 the Nottinghamshire district there is always a clear line of division, 

 and sometimes indications of erosion, between the Avicida-contorta 

 series and the so-called Lower Rhsetic beds, while the latter graduate 

 down uninteruptedly into the Upper Keuper Marls. Further, they 



