Geological Society. 59 



and the radial tubes communicate at their sides with the labyrinthic 

 chamberlets of the lamcllie forming the floor and roof of the inter- 

 spaces. The continuity from the centre of the body to the circum- 

 ference is thus defective, and the body consists of radial tubes and 

 of a labyrinchic structure of a cellular and semicellular character. 



The author maintained that the two structures were intrinsically 

 different ; and he also indicated a difference in the mineral condition 

 of the fossils, Parheria being always phosphatic, whereas no phos- 

 phate of lime could be detected in StoJkzTcaria. 



November 16, 1881.— R. Etheridge, Esq., F.E.S., 

 President, in the Chair. 



The following communications were read : — 



1 . " Additional Evidence on the Land Plants from the Pen-y-glog 

 Slate-quarry, near Corwen." By Henry Hicks, Esq., M.D., E.G.S. 



The author stated that since the date of his former paper (Quart. 

 Jourti. Geol. 8oc., August 1881) he had ascertained that plant- 

 remains occurred in the slaty beds down to the base of the quarry, 

 though much obscured by cleavage. The larger specimens are in the 

 form of anthracite. Mr. Carruthers states that there is sufficient evi- 

 dence to show that they are the remains of vascular plants with some 

 resemblance to the Lycopodiacefe. Some of the fragments are from 

 4 to 5 inches wide, and the author had traced trunks some feet in 

 length. He thought they had drifted to the position where they 

 were now found. Leaf-markings generally are not preserved ; but, 

 from the wrinklings still remaining oii some specimens, he thought it 

 probable they had been covered with leaves spirally arranged. Some 

 fragments show scars arranged irregularly on the surface ; probably 

 these are fragments of roots. The plant seems to some extent to 

 combine the characters of SUgmaria, S'ujilJaria, and Lepidodendron. 

 Further details of the a])pcarance of the specimens were given. For 

 one which appears to differ from all hitherto described he proposes 

 the name of Berwyaia Carruthersii. 



2. " Notes on Protataxites and Pacliytheca from the Denbighshire 

 Grits of Corwen, North Wales." Ey Principal Dawson, LL.D., 

 F.R S., F.G.S. 



The author stated that he had obtained specimens of the Plant- 

 remains from near Corwen, and that among them there were two kinds, 

 one dark, the other light-coloured. In the former the long cells 

 and woody fibres are filled with rods of transparent siliceous matter, 

 an<l the walls represented by a thick layer of carbon. The lighter 

 kind consists of the siliceous rods alone, which are thus in the same 

 state as the asbestos-like silicified Coniferous wood of the Californian 

 gold-gravels. In both the siliceous rods show traces of the irregu- 

 larly spiral ligneous lining of the cell-walls. From these and other 

 characters the author refers the specimens to his genus Prototuxites, 



