44 Reports and Proceedings — Geological Society of London. 



uppei- division, but from the lower division a long list is given of 

 plants collected by the author or preserved in the Woodwardian 

 Museum. A second list of plants, from the upper division of the 

 Carbonaceous Series, is also given, nearly all the specimens having 

 been collected by the author. The consideration of the palaso- 

 botanical evidence enables him to classify the rocks as follows : — 



Permian. 



Upper 



Carboniferous" 



Brockram. 



Sandstone 

 Series. 



Productive 



measures. 



Upper 



Lower 



Upper (Bannock and 

 Main Bands). 



Lower (?) 



Lower Permian. 



(?) Transition Coal-measures 



"Middle Coal-measures. 



(?) Lower Coal-measures and 

 Millstone Grit. 



4. " Some Remarks upon Mr. E. A. Newell Arber's Communi- 

 cation : On the Clarke Collection of Fossil Plants from New South 

 Wales." By Dr. F. Kurtz, Professor of Botany in the University 

 of Cordoba, Argentine Republic. (Communicated by A. C. Seward, 

 Esq., M.A., F.R.S., F.G.S.) 



The author agrees with Mr. Arber's identification of Bhiptozamites 

 Goepperti, which he takes to be a synonym of Noeggerathiopsis 

 Hislopi. Podozamites elongatiis, however, he regards as different 

 from Noeggerathiopsis Hislopi. Reasons are given for holding this 

 opinion. Further, the author does not consider that there is 

 sufficient evidence to warrant the separation of Otopteris ovata from 

 Bhacopteris incequilatera, in which species it may be retained, perhaps, 

 as a variety. Bh. in(equilatera has been found in the Argentine, and 

 was described by Geinitz as Otopteris Argentina. A bibliography is 

 appended. 



5, " On a new Boring at Caythorpe (Lincolnshire)." By Henry 

 Preston, Esq., F.G.S. 



This boring, after piercing Northampton Sands, passed through 

 199 feet of Upper Lias, 19 feet of Marlstone, and into the Middle 

 Liassic Clays. With the aid of other shallow wells in the Lincoln- 

 shire Limestone the author shows that this rock has a decided dip to 

 the west down the face of the escarpment, as though it had settled 

 down upon the eroded surface of the Upper Liassic Clay. This 

 settlement is probably the cause of a continuous spring flowing from 

 the junction, and it has given rise to an underestimate of the 

 thickness of the Upper Lias. 



IL— November 19th, 1902.— Piof. Charles Lapworth, LL.D., F.R.S., 

 President, in the Chair, The following communications were 

 read : — 



1. " The Semna Cataract or Rapid of the Nile : a Study in River- 

 Erosion." By John Ball, Ph.D., F.G.S., A.R.S.M., Assoc. M.Inst. C.E. 



