INTRODUCTION 



STUDY OF THE GENERA OF THE PALEOZOIC BRACHIOPODA. 



II. 



BRACHIOPODA ARTICULATA 



{.CONTINUED^. 



Gbnus SPIRIFER, Sowerby. J815. 



fLATES XXI— XXV, XXIX— XXXIX. 



1815. Spirifer, Sowbbbt. Mineral Conchology, vol. ii, p. 42. 



1818. Spirifer, 8owbrbt. Trans. Linnean Society, vol. xii, p. 514. 



1820. Terebratula, Atwatbr. Amei-ican Joui-nal of Science, vol. ii, p. 244, pi. i, figs. 2, 3. 



1836. Spirifer, Mobtox. AraeHcan Joui-nal of Science, vol. xxix, pp. 150, 152, pi. ii, figs. 1, 3 ; 

 pi. xiv, figs. 34, 35. 



1839. Ddthyri*, Cokbad. Geol. Survey N. Y. ; Third Ann. Rept. PaliEont. Dept., p. 65. 



1840. Ddthyris, Cc-crad. Geol. Survey N. Y. j Fourth Ann. Rept. Palseont. Dept., p. 207. 



1841. Ddthyrig, Cowrad. Geol. Survey N. Y. j Fifth Ann. Rept. Palseont. Dept., p. 54. 



1842. Ddthyrig, Conrad. Jour. Aca<l. Nat. Sci. Philadelphia, vol. viii, pp. 261-265, pi. xiv, figs. 16-18. 

 1842. Spirifer, d'Archiac and db Vbbicboil. Fossils of the older deposits of the Rhenish Provinces, 



p. 394. 

 1842. Dellhyris, Orthit, Vabdxbm. Geology of N. Y. ; Report 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. Spirifer, d'Obbioht. Voyage dans rAmSrique Meridionale, Pal., pp. 41, 48, pi. v, fig. 15 ; 



pi. xii, figs. 1, 2. 



1843. Delthyrig, Mather. Geology of N. Y. ; Rept. Fii-st Dist., p. 342, fig. 1. 



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

 fig. 1 ; p. 171, fig. 5 ; p. 198, figs. 2, 3 ; p. 200, fig. 5 ; pj). 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, Caktelnad. Essai sur le SystAme Silurien de I'Amfirique Septentrionale, pp. 40-43, 



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



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



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



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

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



