INTRODUCTION 



STUDY OF THE GENERA OF THE PALAEOZOIC BRACHIOPODA. 



II. 



BRACHIOPODA ARTICULATA 



(CONTINUED). 



Genus SPIRIFER, Sowerby. J815. 



PLATES XXI— XXV, XXIX— XXXIX. 



1815. iSpirifer, Sowebby. Mineral Conchology, vol. ii, p. 42. 



1818. Spirifer, Sowerbt. Trans. Linnean Society, vol. xii, p. 514. 



1820. Terehratula, Atwater. American Journal of Science, vol. ii, p. 244, pi. i, fig-s. 2, 3. 



1836. Spirifer, Morton. American Journal of Science, vol. xxix, pp. 1.^0, l.')2, pi. ii, figs. 1. 3 ; 

 pi. xiv, figs. 34, 35. 



1839. Delthyris, Conrad. Geol. Survey N. Y. ; Thii-d Ann. Rept. Pateont. Dept., p. 65. 



1840. Delthyris, Conrad. Geol. Survey N. Y. ; Fourth Ann. Rept. Pala;ont. Dept., p. 207. 



1841. Delthyris, Conrad. Geol. Survey N. Y. ; Fifth Ann. Rept. Palfeont. Dept., p. 54. 



1842. Delthyris, Conrad. Jour. Acad. Nat. Sci. Philadelphia, vol. viii, pp. 261-265, pi. xiv, figs. 16-18. 

 1842. Spirifer, D'AntmiAC and de VBBNEniL. Fossils of the older deposits of the Rhenish Provinces, 



p. 394. 

 1842. Delthyris, Orthis, Vanuxem. Geology of N. Y. ; Rexiort Third Dist., pp. 91, 94, 105, figs. 1, 

 2 ; p. 112, fig. 1 ; p. 123, fig. 1 ; p. 124, fig. 5 ; p. 132, fig. 3 ; p. 150, fig. 3 ; p. 179, 

 fig. 3 ; p. 269, fig. 1. 



1842. (Spiiv/er, d'Orbigny. Voyage dans I'Amei'ique Meridionale, Pal., pp. 41, 48, pi. v, fig. 15; 



pi. xii, figs. 1, 2. 



1843. Delthyris, Mather. Geology of N. Y. ; Rept. First Dist., p. 342, fig. 1. 



1843. Delthyris, Hall. Geology of N. Y. ; Rept. Fourth Dist., p. 105, figs. 3, 4 ; p. 142, fig. 1 ; p. 148, 

 tig. 1 ; p. 171, fig. 5 ; p. 198, figs. 2, 3 ; p. 200, fig. 5 ; pp. 202, 205, fig. 3 ; pp. 206. 207, 

 figs. 1, 2, 5; p. 208, figs. 8, 10; p. 245, fig. 1; p. 269, figs. 3. 9 ; p. 270, figs. 1-5. 



1843. Spirifer, Castelnad. Essai sur le Systfeme Silurien de I'Am^rique Septentrionale, pp. 40^3, 



pi. xii, figs. 3-6 ; pi. xiii, figs. 1, 4, 5 ; pi. xiv, figs. (1) 7, 16. 



1844. Delthyris, Owen. Rept. Geol. Expl. of Iowa, Wisconsin and Illinois, p. 69, pi. xii, fig. 9. 



1846. Spirifer, Morris and Sharps. Quart. Jour. Geol. Soc. London, vol. ii, p. 276, pi. ii, figs. 1-3. 



1847. Spirifer, Yandell and Shumard. Contribution to the Geol. of Kentucky, pp. 10, 14, 20, 33. 

 1849. Spirifer, Hall. American Journal of Science, vol. xx, p. 228. 



