402 Geological Society. 
the deposition of the Upper Coal-measures of the North of England, 
the occasional occurrence of this Lingula proving that marine con- 
ditions prevailed at intervals in the Durham area during the accu- 
mulation of those deposits. 
The species now known to be common to the Carboniferous and 
Permian faunz (besides L. Credneri) are Terebratula Sacculus, Mart. 
(T. suffata, Schl.), Spirifera Urii, Flem. (Martinia Clannyana, 
King), Spiriferina costata, Schl. (Sp. octoplicata, Sow.), Camaro- 
phoria Crumena, Mart. (Terebratula Schlotheimii, v. Buch), Camaro- 
phoria globulina, Phil. (Terebratula rhomboidea, Phil.),—on the au- 
thority of Mr. Davidson; Cythere elongata, Minst., C. inornata, 
M‘Coy, Bairdia gracilis, M‘Coy,—on the authority of Mr. Rupert 
Jones ; Gyracanthus formosus, Ag.,—according to Messrs. King and 
Howse; Pinites -Brandlingi, Lindl., Trigonocarpon Noeggerathi, 
Brong., Sigillaria reniformis, Brong., Calamites approximatus, Brong., 
and C. inequalis (?), Brong.,—collected by Mr. Howse in the lowest 
Permian sandstone. From the preceding list of Carboniferous spe- 
cies found also in the Permian strata of Durham, we are able (says 
the author) to see at a glance the specific relationship (so far as at 
present known) which exists between the life-groups of the later 
palzozoic periods, The generic affinity of these groups has long 
been noticed. This affinity and other apparent indications of a 
want of systematic difference originated the proposal that the Per- 
mian should be included in the Carboniferous system; and Mr. 
Kirkby considers that the existence of the several recurrent Carboni- 
ferous species in the Permian rocks strongly supports this view, 
and that “‘ Permian”’ should be retained only as a subordinate term. 
2. «On the Rocks, Ores, and other Minerals on the property of 
the Marquis of Breadalbane in the Highlands of Scotland.” By C, 
H.G. Thost, Esq. Communicated by Prof. J. Nicol, F.G.S. 
After noticing generally the mica-schist of the district, with its 
limestone or calcareous schist, and occasional roofing-slate, the au- 
thor proceeded to describe first the porphyry-vein (half a mile wide), 
containing silver-ore, copper-pyrites, grey copper-ore, iron-pyrites, 
and molybdena, and crossing a vein of non-metalliferous greenstone, 
at Tomnadashan, on Loch ‘Tay opposite Ben Lawers. He then 
pointed out the probable connexion of the existing great valleys 
with lines of fracture due to igneous violence. ‘The veins at Ard- 
tallanaig, containing heavy spar, and ores of zinc, copper, and iron, 
were next noticed. At Correbuich there are two sets of veins in 
the calcareous schist; those having a North and South direction _ 
contain argentiferous galena and traces of gold. The most eastern 
hills on Loch Tay, in the neighbourhood of Taymouth abound with 
quartzose veins containing copper-pyrites, iron-pyrites, and galena. 
The iron-ore of Glenqueich, and the serpentine and chromate of iron 
at Corycharmaig, where graphite and rutile also occur, were next 
noticed. At Lochearn Head there are galena-veins in calcareous 
schist ; here, too, some auriferous arsenical pyrites has been found. 
Lastly the author described in some detail the lead-bearing veins at 
Glen Fallich and Tyndrum, which have been worked for many years, 
