BRACHIOPODA. 
321 
1778. 
1780. 
1785. 
1789-92. 
1793. 
1801. 
1809. 
1811. 
1812-14. 
1S26. 
.1826-38. 
1828. 
1829. 
183'. 
1831. 
1835. 
1836. 
1836. 
1837. 
183S. 
1840. 
1S40. 
1841. 
1841. 
1842. 
1844. 
1844. 
1845. 
1845. 
1847. 
1851. 
1852. 
1852. 
1854. 
1855. 
1855. 
1855. 
1856. 
1857. 
1857. 
Genus PRODUCTUS, Sowerby. 1812. 
PLATE XVIIa, FIGS. 13-24; PLATE XVIII, FIGS. 6-19; and PLATE XIX, FIGS. 1-23. 
Anomia, Da Costa. British Conchology. 
Grypliites, Walch. Beitr. zur Geschichte der Gryphiten. 
Anomia, Pyxis, Chemnitz. Neues Systemat. Konchylien-Kabinet, vols. vii, viii. 
Area, Bbuguiebe. Hist. Naturelle des Vers testaces. 
Anomia, Ure. History Rutherglen and East Kilbride, p. 314. 
Tridacna, Lamarck. Animaux sans Vertebres. 
Anomites, Martin. Petrefacta Derbiensia, pis. xv, xvi, xxii, xxxii, xxxiii, xxxvi, xxxvii. 
Trigonia, Parkinson. Organic Remains, vol. iii, pi. xii, fig. 11. 
Productus, Sowerby. Mineral Conchology. 
Protonia, Linck. Handb. d. physikal. Erdbeschreib. 
Leptcena, Goldfuss. Petrefacta Germanise. 
Leptcena, Dalman. Uppstalln. och Beskrifn. Sver. funne Terebrat. 
Terebratula, Rang. Manuel de l’hist. natur. des Mollusques, etc. 
Mytilus, Fischer. Oryctogr. du Gouv. de Moscou, p. 181, pi. xix, fig. 4. 
Arbtisculites, Murray. Acc’t of A. argentea from Carb. liinest. 
Productus, Conrad. Trans. Geol. Soc. Penna., vol. i, p. 268, pi. xii, fig. 5. 
Productus, Morton. American Journ. Sci. and Arts, p. 153, pi. ii, fig. 2; pi. xxxix, figs. 38, 39. 
Producta, Pinna, Phillips. Geology of Yorkshire, vol. ii. 
Leptcena, Fischer. Oryctogr. du Gouv. de Moscou, p. 144, pi. xxi. 
Productus, Shepard. Am. Journ. Sci. and Arts, vol. xxxiv, p. 153. 
Lima, Yon Buch. Karsten’s Archiv. fur Mineral. Geogn. etc., p. 60. 
Pecten, Eichwald. Bull, scientif. de l’Acad. de St. Petersbourg, vol. vii, p. 86. 
Clavagella, Goldfuss. Petrefacta Germanise, vol. ii, p. 285, pi. clx, fig. 17. 
Leptcena, J. de C. Sowerby. Mineral Conchology, vol. vii, pi. 615. 
Productus, D’Orbigny. Voyage dans l’Amerique Meridionale Palseontology, pp. 51-55, pi. iii, 
figs. 24-26, pi. iv, figs. 1-9, 12, 13, pi. v, figs. 4-10. 
Leptcena, McCoy. Synopsis Charact. Carbon. Limest. Ireland, pi. xix, fig. 12. 
Strophomena, Potiez and Michaud. Galerie des Mollusques de Douai, vol. ii, pi. xlii, fig. 5. 
Productus, de Verneuil. Geol. de la Russie et des Mont, de l’Oural, p. 246. 
Productus, de Verneuil. Travels in North America, vol. ii, p. 221. 
Productus, de Koninck. Recherches sur les Animaux fossiles; Monogr. du genre Productus. 
Leptcena (partim), de Koninck. Descr. des Animaux. Foss, du Terrain Carb. de Belgique. 
Productus, Owen. Geol. Surv. Wisconsin, Iowa and Minn., pp. 103, 136, 584, pi. v, figs. 1, 3. 
Productus, Hall. Stansbury’s Expl. Great Salt Lake Region, p. 412, pi. iii, figs. 3, 5, 6. 
Productus, Shumard. Marcy and McClellan’s Expl. Red River of Louisiana, p. 201, pi. i, fig. 5; 
pi. ii, fig. 1. 
Productus, Norwood & Pratten. Journ. Acad. Nat. Sci. Phila., vol. iii, pp. 6-20, pi. i, figs. 
1-3, 5, 6, 8-11; pi. ii, fig. 1. 
Producta, McCoy. British Palaeozoic Fossils, p. 473. 
Productus of authors generally. 
Productus, Schiel. Rept. Expls. and Survs. from the Mississippi River to the Pacific Ocean, 
pi. i, fig. 3; pi. ii, figs. 4, 5. 
Productus, Shumard. Geol. Rept. Missouri, pp. 201, 216, pi. c, fig. 10. 
Productus, Hall. Rept. Expls. and Survs. from Miss. River to Pacific Ocean, vol. iii, p. 103, 
pi. ii, figs. 16, 17. 
Productus, Prout. Trans. St. Louis Acad Science, vol. i, p. 43, pi. ii, figs. 1-16. 
Productus, Hall. Tenth Rept. N. Y. State Cab. Nat. Hist., p. 180. 
