INTRODUCTION 



1 References^ 



1724 Bromell, M. v. Lithographia Sueeanae. Specimen prim, et secund. Acta lit. 



Sueciae Upsaliae public, v. 1 and 2 (1720-29) 

 1735 Linne, C. v. Systema naturae, ed. 1. Regnum lapideum. Classis 3, Fossilia. 



Ordo. 3 



1821 Wahlenberg, G. Petrificata Telluris Saecanae. Nova Acta Reg. Soc. Scien- 



tiarum Upsal, 8 : 92 



1822 Schlotheim, E. F. v. Petrefaktenkunde, p. 56 

 1828 Brongniart, A. Histoire des Vegetaux Fossiles, p. 70 



Nilsson. See Dr Beck in Murchison. Silurian System, p. 696 

 1837 Hisinger, W. Lethaea Suecica, seu Petrificata Sueciae. Supplementum 



1839 Murchison, R. J. Silurian System, pt 2, p. 695 



1840 Quenstedt, F. A. Ueber die vorziiglichsten Kennzeichen der Nautileen, Neues 



Jalirb. fiir Mineral, p. 253 

 1842 Geinitz, H. B. Neues Jabrbucli fiir Mineralogie, p. 697 



1842 Vanuxem, L. Geology of New York. Report on Tbird District 



1843 Portlock, J. E. Geological Report on Londonderry, Tyrone and Fermanagh 

 1843 Mather, W. W. Geology of New York. Report on First District 



1843 Emmons, E. Geology of New York. Report on Second District 

 1843 Hall, J. Geology of New York. Report on Fourtb Geological District 



1846 Geinitz, H. B. Grundriss der Yersteinerungskunde, p. 310 



1847 Hall, J. Palaeontology of New York, v.l 



1848 Sedgwick, A. On tbe Organic Remains found in the Skiddaw Slates, etc. Quar. 



Jour. Geol. Soc. 4 : 216 

 1850 Barrande, J. Graptolites de Boheme extraits du systeme silurien du centre de la 

 Bobeme 



1 For lists of graptolite literattire, see Perner, J. fitudes sur les Graptolites de Boheme, 2 i^me 

 partie, p. 3; Wiman, C. Ueber die Graptoliten, p. 2; Roemer & Freeh. Lethaea palaeozoica, 

 1 : 544 ; EUes & Wood. Monogi-aph of British Graptolites. The list here given does not contain the 

 greater iiortion of the literature on Upper Siluric forms. 



