On the Structure and Affinities of Palaeodiscus and Agelacrinus . nntniss der Eossilen Eauna des Devonischen Gebirges am Rhein. Yerh. d. Natur. Hist. Yer. und Westfalen, vol. 8, p. 372. 18. Salter. 1857. ( On some New Palaeozoic Starfishes.) Ann. Mag. Nat. Hist., Ser. 2, vol. 20. 19. Schmidt, E. B. von. 1874. Ueber einige neue und wenig bekannte Baltisch- Silurische Petrefacten. Mem. Acad. , St. Petersburg (7), vol. 21, pp. 34 and 35. 20. Sollas, W. J. 1889. On Silurian Echmoidea and Ophiuroidea. Quart. Journ. Geol. Soc., vol. 45, 1889, pp. 692— Phil. Trans., Seri
On the Structure and Affinities of Palaeodiscus and Agelacrinus . nntniss der Eossilen Eauna des Devonischen Gebirges am Rhein. Yerh. d. Natur. Hist. Yer. und Westfalen, vol. 8, p. 372. 18. Salter. 1857. ( On some New Palaeozoic Starfishes.) Ann. Mag. Nat. Hist., Ser. 2, vol. 20. 19. Schmidt, E. B. von. 1874. Ueber einige neue und wenig bekannte Baltisch- Silurische Petrefacten. Mem. Acad. , St. Petersburg (7), vol. 21, pp. 34 and 35. 20. Sollas, W. J. 1889. On Silurian Echmoidea and Ophiuroidea. Quart. Journ. Geol. Soc., vol. 45, 1889, pp. 692— Phil. Trans., Series B, vol. 196. 21. Sowerby, G. B. Zoological Journal, vol. 2. 22. Thomson, C. Wyville. 1881. ( On a new Pals&ozoic Group of Echinoder- mata.) Edin. New Phil. Journ., ,vol. 13, pp. 106—117. 23. Wright. British Eossil Echinodermata of the Oolitic Eormations, vol. 2 ; * The Asteroidea and Ophiuroidea. Palseontogr. Soc., 1863—1880. 24. Zittel, K. A. 1879. Handbuchder Palseontologie, 1. Band, Palseozoologie. Spe ncer. Hoy. Soc. Proc., vol 74, Plate JT V3 Fia. 1.—Oasfc of ValcEodiscus ferox in the Oxford Museum ; An ~ Anus. TIT
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