cl 



BRITISH GRAPTOLITES. 



1901. 



Eisel, E., 



" Zonenfolge ost 



Thiiringischer und 



Vogtliindischer 



Graptolithensehiefer," 



' Jalirb. Gesell. Freund. 



Naturwissenschaften 



in Gera,' year 1900. 



This Memoir is remarkable as being the first to demon- 

 strate the fact that the zonal succession of Graptolite species 

 in Central Germany corresponds closely with that already 

 established in Britain and North-West Europe. It is the 

 fruit of the enthusiastic researches of the author carried on 

 for many years into the chronological succession of Graptolite 

 species in the Thuringian areas, long previously rendered 

 classic by the works of Geinitz and Richter. 

 The author makes known the presence of several successive Graptolite zones 

 in the sequence described, which ranges from Middle Llandovery to Lower 

 Ludlow, and gives the names and ranges of the forms collected by himself 

 personally. The zones described are distinguished by the author by names derived 

 from their characteristic local species, and the following forms are given as new : 

 Monograptus priodon, var. reductus ; M. veles; M. Sedgwickii, var. Voglandicus; 

 Diplograptus binodosus; D. juncus ; D. Thuringiacus ; Retiolites praecursor; Olima- 



cograptus citrocrescens ; Dimorphograptus Lapworthi. (See also Tornquist, 1887.) 

 1901. 



Ruedemcmn, B., 

 '* Hudson Eiver Beds 

 near Albany, and their 

 Taxonomic Equiva- 

 lents," ' New York- 

 State Mus.,' Bull. 42. 



A summary of the author's discoveries among the com- 

 plicated Graptolite-bearing strata of the Hudson River 

 Valley. 



CHAPTER V. 



1902 to 1913. 



1902. 



Moberg, J. C, 



" Didymograptus 



Skiffer," ' Geol. Foren. 



Fort.,' vol. 24, 



pp. 44-48. 



The author proposes to unite under the single title 

 " Didymograptus Skiffer " all the Scandinavian Graptolite- 

 bearing strata ranging from the horizon where Didymograptus 

 makes its earliest appearance to the top of the Didymograptus 

 geminus beds. 



This Second Part of the British Monograph opens with 

 the first two chapters of the promised "General Section." 

 These chapters (pages i to xxviii) treat of the History of 

 Research among the Graptolites in general from the times 

 of Bromell and Linnaeus (1727) to those of Barrande (1850) 

 and Scharenberg (1851). References are made to the titles 

 and dates of publication, etc., of the several Memoirs cited, and a synopsis is given 

 of the more important facts and deductions brought forward by each author. 



This " General Section " is followed (pp. 55-102) by the continuation from 

 Part I. of the "Descriptive Section." It treats of the whole of the British species 



1902. 



Elles and Wood, 



" Monograph of British 



Graptolites," pt. 2, 



Palseoutographk-n 1 



Society, 1902. 



