Geological Society of London. 



437 



opinion regarding the stratigraphical position of the Coniston Flags, 

 proceeded to describe the following species : — 



Diplograpsus palmeus, Barr. 



D. folium, Ilis. 



J), afigustifoliiis, Hall. 



B. confertus^ Nich. 



B. tamariscus, Nich. 



D. pristis, His. 



Retiolites perlatus, Nich., nov. sp. 



Rastrites Linncci, Barr. 



Climacogrnpms [Diplograpsus) teretius- 



cuius, Ilis. 

 Rastrites peregrinus, Barr. 

 Graptolites lobiferus, M'Coy. 



Graptolitea Sedgwickii, Portl. 



G. jimbriaius, Nich. 



G. Nilssoni, Barr. 



G. tenuis, Portl. 



G. discretui, Nich. 



G. Bohemicus, Barr. 



G. priodon, Bronn. 



G. colonus, Barr. 



G. Sagittarius, Liiin. 



G. turriculatus. 



G. Sedgwickii, Portl. 



var. spinigenis, Nich. 



16. '' On the ' Waterstone Beds ' of the Keiiper, and on Pseudo- 

 morphous Crystals of Chloride of Sodium." By G. W. Ormerod, 

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



Between Salcomb Mouth and the Kiver Sid, and between Bud- 

 leigh Salterton and Littleham Bay, several beds of ripple-marked 

 " Waterstone " occur, and also pseudomorphous crystals of chloride 

 of sodium. A small fragment of Waterstone exhibited apparently 

 traces of reptilian remains. In conclusion, the author drew attention 

 to the fact that pseudomorphs occur over the greater part of the 

 Triassic area in England. 



17. ''On the discovery of the remains of Pteraspidian Fishes in 

 Devonshire and Cornwall, and on the identity of Steganodictyum cor- 

 nulicum, M'Coy, wdth Scaphaspis {Archceoteuthis) Dimensis, Koemer." 

 By E. Eay Lankester, Esq. 



A specimen labelled " Pteraspis'' from the Lower Devonian slates 

 of Mudstone Bay, in the collection of the late Mr. Wyatt-Edgell, was 

 at once referred by Mr. Salter to the Steganodictyum of M'Coy ; and 

 on further research, he concluded that M'Coy's supposed sponge is 

 actually the cephalic plate of a Pteraspidian fish. The author fully 

 endorsed Mr. Salter's determination, and inferred that the specimens 

 of Steganodictyum Carteri are really head-plates of true Cephalaspis. 



18. " On the Geological peculiarities of that part of Central Ger- 

 many known as the Saxon Switzerland." By the late Capt. James 

 Clark. Communicated by Sir R. I. Murchison, Bart., K.C.B., 

 F.R.S., etc. 



The author described in detail the rocks of which the district under 

 consideration is composed ; namely, 1, the Upper Quader Sandstone ; 

 2, Planer Limestone ; 3, Planer Marl ; 4, Lower Quader Sandstone ; 

 and gave a list of their chief fossils. 



The peculiarities of this region consist, first, in the abrupt and 

 marked variations of altitude without any corresponding inclination 

 or dislocation of the strata. Secondly, in the remarkable regularity 

 of the fissures by which the rocks are divided, which cross them at 

 right angles. Thirdly, in the phenomena observable along the line 

 of separation between the Quader and the Lusatian granite ; the 

 Quader being overlain by the granite and syenite. Fourthly, in the 

 disposition of the basalt, which rises through the granite and the 



