70 REPORT — 18G7. 



Hycena speleea, Goldf. Alluvions quaternaires du plateau de la lioque, pres Bor- 

 deaux; cavernes des Pyrenees, de la Dordogne, &c. 



Hyana striata, Zimm. {H. prisca, Marcel de Serres). Breche de I'Estalient, pres 

 Bagneres. 



OiSEAUx DES Cavernes. (Alph. Milne-Edwards.) 



Gypaetes barbatus, Teium. Cavernes de la Dordogne. 



Milvus regalis, Vieill. Cavernes de la liaute Garonne, 



Falco tinnunculus, Vieill. Cavernes de la Dordogne. 



Buteo cinereus, Gmel. Caverne d'Aiuiguac. 



iVe/ctea wtt'Crt, Vieill. {Strix lapponica, Gm.). Dordogne. 



Hirundo rupestris, Tenini. Caverne de Lourdes. 



Conns conu; Vieill. Dordogne. 



Corvus jnca, Temiu. Dordogne. 



Pyrrochorax alpinus, Vieill. Dordogne. 



Tetrao layynis, L, Cavernes de Lomdes. 



Tetrao atbtis, L. Dordogne. 



Tetrao uroyallm, L. Dordogne. 



Griis primigenia, jVlph. IMilne-Edwards. Dordogne. 



Parmi ces aniniaux les Elephans, les Rhinoceros, le Cerf d'Irlande, les Spermo- 

 philes, rOiu-s des cavernes, les i^eZis, I'Hyene, et la Grue ont disparu ; d'autres ont 

 emigre, soit vers le nord soit siu- les liautes cimes des Alpes et des Pjrrenees. Ce 

 sont le Renne, le Boeul'-musque, 1' Aurochs, le Bouquetin d'Espagne, le Chamois, 

 la Marmotte des Alpes, le Castor, le Lynx, la Chouette de Lapouie et les Tdrao. 

 Le caractere general eminemment arctique de cette faune uous montre que le climat 

 des Pyrenees etait a cette epoque plus rigoureux qu'il ne Test actuellement. La 

 zoologie confirme done compl^tement les donniSes de la geologic. 



On the Cambrian Hods of Llanheris with reference to a Break in the Conform- 

 able Succession of the Lower Beds. By George Maw, F.G.S., F.L.S., 4'c. 



A section was exhibited of the lower part of the Cambrian series along the 

 southern bank of Ll-\ai Padiirn, which was not visible at the time the Llanberis 

 district was mapped by the Geological Survey. 



A cutting on the branch railway from Carnarvon, now in course of formation, 

 has exposed the structure of the lower beds and the most complicated part of the 

 series. Underneath the beds worked for slates in the Diuorwic and Glyn quar- 

 ries there occurs a considerable thickness of a compact rock obscurely banded with 

 dark olive-green and dull bufl", which rests uncouformably on the uptm-ned edges 

 of a still more ancient slate-rock. Many of the similar dark-green bauds inter- 

 stratified vnih the workable slates of the higher series, and which have been 

 grouped with the Cambrian grits and pebble-beds, contain isolated fragments of 

 altered slate, and wherever they are in contact with the blue or purple slates a 

 thin course of altered green slate occurs at the junction. 



Towards the lower part of the Upper series in the Glyn quarries the green 

 matter occurs as a multitude of thin bands, in contact with which the slate has 

 been altered to a pale green. 



The dark-green bands were found on analysis to exhibit a totally different com- 

 position to that of the slate-matrix, and appeared to have been derived from a 

 different som-ce. 



With reference to the condition of fusion under which the dj'kes of gi'eenstonc 

 were intruded, judging from the kind of alteration produced in the adjacent slate, 

 the heat could not have been sufficient to effect a pui-ely vitreous liquefaction, as 

 experiments proved that the slaty matrix was fusible at a lower heat than that at 

 which the greenstone was refractory. 



On Tertiary and PosUertiary Action in the Pyrenees. 

 By P. W. Stuart Menteath. 



