INTRODUCTION 
TO THE 
STUDY OF THE GENERA OF THE PALilOZOIC BRACHIOPODA. 
II. 
BRACHIOPODA ARTICULATA 
(CONTINUED). 
Genus SPIRIFER, Sowerby. 1815. 
PLATES XAI—XXV, XXIX—XXXIX. 
1815. iSpirifer, Sowerby. Mineral Conchology, vol. ii, p. 42. 
1818. Spinfer, Sowerby. Trans. Linnean Society, vol. xii, p. 514. 
1820. Te)'ebratula, Atwater. American Journal of Science, vol. ii, p. 244, jil. i, figs. 2, 3. 
1836. Spirifei', Morton. American Journal of Science, vol. xxix, pp. 150, 152, pi. ii, figs. 1, 3; 
pi. xiv, figs. 34, 35. 
1839. Delthyris, Conrad. Geol. Survey N. Y. ; Thii'd Ann. Kept. Palseont. Dept., p. 65. 
1840. Delthyris, Conrad. Geol. Survey N. Y. ; Fourth Ann. Kept. Palseont. Dept., p. 207. 
1841. Delthyris, Conrad. Geol. Survey N. Y. ; Fifth Ann. Rept. Palseont. Dept., p. 54. 
1842. Delthyris, Conrad. Join-. Acad. Nat. Sci. Philadelphia, vol. viii, pp. 261-265, pi. xiv, figs. 16-18. 
1842. iSpirifer, d’Archiac and de Verneuil. Fossils of the older deposits of the Rhenish Provinces, 
p. 394. 
1842. Delthyris, Orthis, Vanuxem. Geology of N. Y. ; Report Third Dist., pj). 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. d’Orbigny. Voyage dans I’Amerique Meridionale, Pal., pp. 41, 48, pi. v, fig. 15; 
pi. xii, figs. 1, 2. 
1843. Delthyris, Mather. Geology of N. Y. ; Rex^t. Fii-st Dist., p. 342, fig. 1. 
1843. Delthyris, Hall. Geology of N. Y.; Rexit. Fourth Dist., p. 105, figs. 3, 4 ; x>. 142, fig. 1; xi. 148, 
fig. 1 ; p- 171, fig. 5 ; p-198, figs. 2, 3 ; p. 200, fig. 5 ; x'p. 202, 205, fig, 3; pp. 206, 207, 
figs. 1, 2, 5; XL 208, figs. 8, 10; p. 245, fig. 1; x^. 269, figs. 3, 9 ; p. 270, figs. 1-5. 
1843. iSpinfei’, Castelnad. Essai sur le Syst^me Silurien de I’Am^rique Septentrionale, x^X^- 40-43, 
X^l. xii, figs. 3-6; pi. xiii, figs. 1, 4, 5 ; pi. xiv, figs. (?) 7, 16. 
1844. Delthyris, Owen. Rept. Geol. Expl. of Iowa, 'Wisconsin and Illinois, ii. 69, pi. xii, fig. 9. 
1846. /Spirifer, Morris and Sharpe. Quart. Jour. Geol. Soc. London, vol. ii, p. 276, xd- ii, figs. 1-3. 
1847. Spinfe)', Yandell and Shdmard. Contribution to the Geol. of Kentucky, xip- 10, 14, 20, 33. 
1849. ISpirifer, Hall. Ameilcan Journal of Science, vol. xx, p. 228. 
