BRACHIOPODA. 
241 
Genera (1) BARRANDELLA, nom. propos.; (2)PENTAMERELLA, 
Hall, 1867; (3)SIEBERELLA, (Ehlert, 1887; (4) GYPIDULA, 
Hall, 1867. 
PLATES LXXl, LXXII. 
(3) 
1827. 
(3) 
1834 
(3) 
1839. 
(1) 
1839. 
(2) 
1841. 
(3) 
1843. 
(3) 
1845. 
(I) 
1848. 
(4) 
1852. 
(1) 
1852. 
(2) 
1857. 
(1) 
1857. 
(3) 
1857. 
(1) 
1858. 
(4) 
1858. 
(3) 
1859. 
(3) 
1859. 
(1) 
1860. 
(2) 
1860. 
(3) 
1860. 
(1) 
1861. 
(1) 
1863. 
(3) 
1865. 
(1) 
1866. 
(4) 
1866. 
(1) 
1867. 
(1) 
1867. 
(2) 
1867. 
(3) 
1;67. 
(4) 
1867. 
(4) 
1868. 
(1) 
1871. 
(1) 
1875. 
(3) 
1878. 
(4) 
1878. 
(1) 
1879. 
Atrypa, Dalman. Kong-1. Vetenskaps. Acad. Handlingai-, p. 130. 
Terebratula, von Buck. UeVier Terebi-ateln. 
Atrypa, J. de C. Sowerby. Silurian System, pi. xii, tig. 4. 
Atrypa, J. de C. Sowerby. Silurian System, pi. xiii, tig. 8. 
Atrypa, Conrad. Geol. Sui-vey N. Y. ; Ann. Kept. Palseont. Dept., p. 55. 
Terebratula, A. Robmer. Verstein. des Harzgebirges, p. 19, pi. xii, fig. 25. 
Pentamerus, de Verneuil. Geologie de la Russie, etc , vol. ii, p. 120, p)l. viii, figs. 3 a-g. 
Pentanierus, Davidson and de Verneuil. Bull. Soc. Geol. de France, second ser., vol. v, 
pp. 333, 346. 
Atrypa, Owen. Geol. Survey Wisconsin, Iowa and Minnesota, x). 583, pi. iiiA, fig. 4. 
Pentamerus, Hall. Paleontology of New York, vol. ii, p. 81, pi. xxiv, 6gs. 7 a-d. 
Pentamerus, Hall. Tenth Ann. Reiit. N. Y. State Cab. Nat. Hist., x>. 120, tigs. 1-10. 
Pentameims, Billings. Rexit. Pi og. Geol. Survey of Canada, xi. 296. 
Pentamerus, Hall. Tenth Ann. Rept. N. Y. State Cab. Nat. Hist., x>. 105, figs. 1-3. 
Pentamerus, F. Scumidt. Silur. Format. Estlands; Archiv fiii- Naturkunde, vol. ii, x>. 212. 
Pentamerus, Hall. Geology of Iowa, vol. i, pt. 2, x^. 914, x^b vi, figs. 2 a-c. 
Pentamerus, Hall. Paleontology of New York, vol.iii, p. 257, pi- xlvi, figs. 1 a-z; pi- xlvii, 
figs. 1 a-m. 
Pentamerus, von Eichwald. Lelhaea rossica, vol. i, xil- xxxv, figs. 19, 20. 
Pe7itamerus, Lindstrom. Ofversigt kongl. Veten. Acad. Forhandl., xl 365, iil. xii, tig. 6. 
Pentamei’us, Spirifer, Hall. Thirteenth Ann. Rexit N. Y. State Cab. Nat. Hist., XR'. 86, 90. 
Pentamerus, F. Roemer. Silur. Fauna des westl. Tennessee, x^- 13, xd. v, fig. 11. 
Pentamerns, Hall. Rexit. Progress Geolog. Survey Wisconsin, x'- 2. 
Pentamerus, Billings. Geology of Canada, xi- 316, fig. 327. 
Pentamerus, Winciiell and Marcy. Mem. Boston Soc. Nat. Hist., vol. i, xi. 94, i)l. ii, fig. 11. 
Pentamerus, Billings. Catalogue Silurian Fossils Anticosti, xi- 49- 
Pentamerus, Meek and Worthen. Geol. Survey Illinois, vol. ii, p. 325. 
Pe^damtrus, Davidson. British Silurian Brachioxioda, xi- 149, xd- xvii, figs. 11-14. 
Pentamerus {PentamereUa), Hall. Twentieth Ann. Rexit. N. Y. State Cab. Nat. Hist., 
XI. 374, xil. xiii, tigs. 18-21. 
Pentame^'ella, Hall. Paleontology of New York, vol. iv, x^P- 373, 375-379, xd. Iviii, 
tigs. 1-21, 24-43. 
Pentamei'us, Davidson. British Silurian Brachioxioda, xi- 145, xd. xv, figs. 13-23. 
Gypidula, Hall. Paleontcdogy of New York, vol. iv, xip. 373, 380, 381, xil- Iviii, figs. 22, 23 ; 
Xil. Iviii A, figs. 1-8. 
Pentarnerus, Meek and Worthen. Geological Survey of Illinois, vol. iii, pp- 428, 429, pi. xiii, 
tigs. 5, 6. 
Pentainei-us, Qubnstedt. Peti-efactenkunde Deutschlands; Brachioxioden, x'- 222, xd. xliii, 
figs 44, 45. 
Pentamerus, Hall and Whitfield. Paleontology of Ohio, vol. ii, p. 138, xil- vii, figs. 7, 8. 
Pentamerus, Kayser. Abhandl. zur geol. Specialkarte von Preussen, etc.. Bud. 2, Heft 4, 
Xifi. 156-159, xil- XXvii, figs. 1-9, 13. 
Gypidula, Calvin. Bull. U. S. Geol. Survey of the Terr., vol. iv, p. 730. 
Pentamerus, Ulorbida, Barrande. Systeme Silurien, vol. v, pis. xxii, xxiv, cxix, cxxxviii. 
