TRANSACTIONS OF SECTION C. 



599 



Grapliite. 



Sulphur. 



Gold. 



Silver. 



Copper. 



Stibnite. 



Molybdenite. 



Galena. 



Chalcocite. 



Blende. 



Pyrrhotite. 



Uornite. 



Chalcopyritc. 



Pyrites. 



Cobaltite. 



iMarcasite. 



Mispickel. 



Tetrahedrite. 



Geocronite. 



Halite. 



Fluor. 



Quartz. 



Tridymite. 



Opal. 



Water. 



Cuprite, 



Corundum. 



Hrematite. 



Ilmenite. 



Magnetite. 



Cassiterite. 



Eutile. 



Octahedrite. 



Brookite. 



Pyrolusite. 



Manganite. 



Limonitc. 



Br.uxite. 



Psilomelane. 



Calcite. 



Dolomite. 



Siderite. 



Aragonite. 



Smithsonite. 



Cerussite. 



Malachite. 



Azurite. 



Orthoclase. 



Microcline. 



Anorthoclase. 



Albite. 



Oligoclaso. 



Andesiiie. 



Labradorite. 



Anorthite. 



Enstatite. 



Hypersthene. 



Augite. 



Spodumene. 



Wollastonite. 



Rhodoniic. 



Hornblende. 



Arfvedsonite. 



Beryl. 



lolite. 



Garnet. 



Olivine. 



Fayalite. 



Idocrase. 



Zircon. 



Topaz. 



Andalusile. 



Sillimanite. 



Kj'anite. 



Gadoiinite. 



Zoisite. 



Epidote. 



Axinite. 



Calamine. 



Tourmaline. 



Staurolito. 



A])ophyllite. 



Heulandite. 



Epistilbite. 



Phillipsite. 



Harmotome. 



Stilbite. 



Laumonil e. 



Chabazite. 



G melinite. 



Levyne. 



Analcite. 



Natrolite. 



Scolecite. 



Mesolite. 



Thomsonite. 



Mu.scovite. 



Biotite. 



Lcpidouielane. 



Serpentine. 



Talc. 



Glauconite. 



Kaolinite. 



Pyropliyllite. 



Sphene. 



Apatite. 



Pyromorphite. 



Vivianite. 



Erythrite. 



Wavellile. 



Beudantite. 



Barytes. 



Anglesite. 



Gypsum. 



Amber. 



A number of other species (about twenty-two), which have been recorded by 

 more or less competent authorities, are not inserted in the foregoing list, as there 

 appears to be some doubt at present as to their correct determination, and because 

 specimens of many of them cannot now be found in any museum or private collec- 

 tion. 



On the Tiifks and Skull 0/ Mastodon angustidcns. 

 Ui/ C. VV. Andrews, B.Sc. 



Report on the lier/istration 0/ all Type Spnciuicns of British Fossilf. 

 ►See Reports, p. 210. 



8. 2ioteii on the Fosniln of the Silurian Area of N.E. Ireland} 



By R. Clark. 



It would be difficult, after the closest investigation, to add mucli to the ex- 

 haustive list of species given in the excellent paper on this subject which was read 

 by 3Ir. Swanston before the Belfast Naturalists' Field Club some twenty-five years 

 ago. 



In that paper reference is made to the classification by the Geological Survey 

 of the rocks ot the district, under the general heading of Lower Silurian, 



Subsequent to the publication of the maps of the area the information as to 

 the Silurian fauna was greatly extended by the labours of Professor Lapworth and 

 ]\[r. Swanston, to whom science is so largely indebted. The completion of the 

 1-iuch geological map of Ireland enabled the revision of work done in the earlier 



' Communicated by permission of the Director of the Geological Survey. 



