•clvi 



BRITISH GRAPTOLITES. 



These are illustrated in seventeen excellent quarto plates, in which the 

 majority of the forms are given in natural size and detail. 



The letterpress of the work is enriched by 106 Text- figures, most of them on 

 a common scale of five times the original size. 

 1905. 

 Flamande, B. M., 

 "Existence deschistes Note ot the discovery of Graptolites of Silurian Age in 



a G-raptolithes a Haci- * ne Sahara, by Captain Cottenest and Mons. M. Foureau, in 

 El-Kheuig (Sahara 1902, with a description of the position and lithology of the 

 Central)," < Comptes containing rocks. 

 Rendus Acad. Sciences,' 

 vol. cxl, pp. 954-957. 



A brief account of the author's discovery of Silurian 

 (Llandovery) Graptolites in the strata of the High Atlas, 

 Morocco, with lists of species present and notes upon the 

 forms previously obtained from Silurian strata in the Sahara. 

 (See also Munier Chalmas, " Notice sur les travaux scien- 

 tifiques," Lille, 1903, p. 94, and " Documents de la Mission 

 Saharienne," by MM. Foureau, Gentil and Haug, 1905, 

 pp. 755-756. 



A detailed description of the geological succession 

 ranging from the base of the Upper Cambrian to the Middle 

 Bala in the classic Arenig region. Some twenty-five species 

 of Graptolites are named as present in the succession, and 

 their relative horizons and ranges are carefully noted. 



A description of the species of Graptolites collected by 

 Herr Bjorlekke, of the Geological Survey of Norway, in the 

 Ordovician Shales of Bratland, Gudbrandsdal, in 1890. Ten 

 distinct forms are noted, and illustrated on a plate. Two 

 forms are given as new : Dicellograptus laxatus and Didymo- 

 graptus euodus (Lapworth) var. Bjorlekki. A table is given 

 (p. 5) showing the distribution of the Bratland forms in 

 Norway, Sweden, Great Britain, and North America, and the containing strata 

 are assigned to the higher Arenig rocks of the British Succession (Zones of 

 Didymograptus extensus and B. hirundo). 



1905. 



Gentil, L., 



" Sur la presence de 



schistes a Graptolithes 



dans le Haut- Atlas 



Marocain," 'Comptes 



Rendus Acad. Sciences,' 



vol. cxl, p. 1659. 



1905. 



Fearnsides, W. G., 



"The Geology of Arenig 



Fawr and Moel Llyf- 



nant," ' Quart. Journ. 



Ceol. Soc.,' vol. lxi, 



pp. 608-640. 



1905-6. 



Lapworth, C, 



" On the Graptolites 



from Bratland, Gaus- 



dal, Norway," ' Norges 



Ceol. TJndersogelse,' 



no. 39. 



1905. 



Pirie, J. H., 



" Graptolite-bearing 



Rocks of the South 



Orkneys, 'Proc. Roy. 



Soc. Edinburgh,' 

 vol. xxv, pp. 463-470. 



A note of the discovery of the genus Pleurograptvs in 

 the sedimentary rocks of the South Orkney Islands, 800 miles 

 south-east of Cape Horn. 



