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Stäche, G., Über die Graptolithen der schwarzen Kieselschiefer am Osternig zwischen 

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Tullberg, S. A., Tvenne nya Graptolitslägten. (Med 1 Tan.) in : Geol. Foren. Stock- 

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Voortplantings-zakjes bij Graptolithen. Door D. L[ubach]. in: Album der 

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(Nach J. Hopkinson, in Ann. a. Mag. nat. hist. 1868, May. — The Academy, 1871, May 15. p. 268.) 



Young, John, [On Graptolites from Silurian strata of the Girvan Valley.] in: Proc. 

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Zeuschner, [Ludwig], Briefliche Mittheilung [Graptolithen im Silur des polnischen Über- 

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Hall, James, On the Genus Graptolithus. in: Edinb. new phil. Journ. N. Ser. Vol. 11. 

 1860. p. 167—169. 



Note upon the genus Graptolithus and description of some remarkable new forms 



from the shales of the Hudson River Group, discovered in the investigations of the 

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Notes upon the genus Graptolithus, with remarks upon some of the species, their 



mode of growth, and manner of reproduction. in: 12. Ann. Report New York State 

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Notices of new forms of the genus Graptolithus and allied genera. ibid. 13. Ann. 



Rep. 1860. p. 55—64. 



Duncan, P. Martin, On the Structure and Affinities of Guynia annulata, Dune, with Re- 

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Fischer- Benzon, R. v., [Mikroskopische Untersuchung der Structur von Halysites 

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Mikroskopische Untersuchungen über die Struktur der Halysites- Arten u. einiger 



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Duncan, P. Martin, On Heterophyllia. in: Geol. Mag. Vol. 5. 1868. p. 584. 



Young, John, On the Identity of Heterophyllia Lyelli and H. mirabilis of Duncan. 

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Heterophyllia Lyelli: s. a. H. mirabilis (Young). 



Fielding, Edward, On Heterophyllia mirabilis, Duncan. in: Geol. Mag. Vol. 5. 1868. 



p. 533—534. 



Note; byEdit. Geol. Mag. ibid. p. 534. 

 Wilde, G. R. de, On Heterophyllia mirabilis, Duncan. in: Geol. Mag. Vol. 5. 1868. 



p. 533. 



Young, John, Heterophyllia mirabilis, Duncan. ibid. Vol. 6. 1869. p. 42. 



Heterophyllia mirabilis and H. Lyelli. ibid. Vol. 5. 1868. p. 582—583. 



Heterophyllia mirabilis Duncan. ibid. Vol. 5. 1868. p. 583—584. 



Heterophyllia mirabilis: s. a. H. Lyelli. 



[Carter, H. J.], A Carboniferous Hexactinellid Sponge. (Abstr.) in: Popul. Sc. Review. 

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(Ann. Mag. Nat. Hist. 4. Ser. Vol. 20. 1877. — Original s. unter Porifera.) 



Kent, W. Saville, M. K. A. Zittel on Fossil Hexactinellida. in: Ann. Mag. Nat. Hist. 



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