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1843. Spirifer, Castelnad. Essai sur le Syst. Sil. de l’Amerique septentrionale, p. 42. 
1843. Orthis, Strophomena, Conrad. Proc. Acad. Nat. Sci., Philadelphia, vol. i, pp. 133, 332, 333. 
1843. Orthis, Delthyris, Atrypa ? Hall. Geology of N. Y.; Rept. Fourth Dist., pp. 70, 71,105, 175, 215, 
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1844. Orthis, Delthyris {partim), Owen. Rept. Geol. Expl. Iowa, Wisconsin and Illinois, plates xii, 
1845. Orthis, Hall. American Journal of Science, vol. xlviii, p. 294. 
1846. Orthis, McCoy. Synopsis Silurian Fossils Ireland, p. 32. 
1847. Orthis, Delthyris, Leptcena, Hall. Palaeontology of N. Y., vol. i, pp. 20, 113, 117, 136, 288, 289. 
1847. Orthis, Yandell and Shumard. Contribution Geology Kentucky, p. 21. 
1852. Orthis, Owen. Rept. Geol. Surv. Wisconsin, Iowa and Minnesota, p. 585. 
1852. Orthis, Spirifer, Hall. Palaeontology of N. Y., vol. ii, pp. 56-58, 65, 252-255, 260. 
[1] 1855. Orthis, Shomard. Rept. Geol. Surv. Missouri, p. 205. 
1856. Orthis, Billings. Canadian Naturalist and Geologist, vol. i, pp. 40, 134, 136, 205, 206. 
1857. Orthis, Hall. Tenth Ann. Rept N. Y. State Cab. Nat. Hist., pp. 41-46, 102, 110, 135. 
1857. Oi-this, Billings. Rept. Prog. Geol. Surv. Canada, p. 296. 
1857. Orthis, Cox. Owen’s Geol. Surv. Kentucky, vol. iii, p. 570. 
1858. Orthis, Marcou. Geology of North America, p. 48. 
1858. Orthis, Hall. Transactions Albany Institute, vol. iv, p. 12. 
1858. Orthis, Hall. Geology of Iowa, vol. i, pt. ii, pp. 486, 596. 
1858. Orthis, Delthyris, Rogers. Geology of Penn., vol. ii, part 2, pp. 818, 820. 
1858. Orthis, Swallow. Trans. St. Louis Acad. Science, vol, 5, p. 218. 
1859. Orthis, Billings. Hind’s Expl. Assiniboine, Saskatchawan. etc., p. 193. 
1859. Orthis, Billings. Canadian Naturalist and Geologist, vol. iv, pp. 434-440, 442. 
1859. Orthis, Salter. Canadian Organic Remains, Decade i, p. 39. 
1859. Orthis, Hall. Palaeontology of N. Y., vol. iii, pp. 162-172, 174-176, 179, 409, 481. 
1859. Orthis, Strophomena, Hall. Twelfth Ann. Rept. N. Y. State Cab. Nat. Hist., pp. 66, 70, 72, 85. 
1860. Orthis , Hall. Thirteenth Ann. Rept. N. Y. State Cab. Nat. Hist., pp. 7S-80, 111, 120, 121. 
1860. Orthis, Shomard. Trans. St. Louis Acad. Science, vol. i, p. 627. 
1860. Orthis, F. Rcemer. Die silur. Fauna westlich. Tennessee, pp. 62, 63. 
1860. Orthis, Billings. Canadian Journal Science and Arts, vol. v, pp. 267, 269. 
1860. Orthis, Swallow. Trans. St. Louis Acad. Science, vol. i, p. 639. 
1860. Orthis, White. Journal Boston Society Natural History, vol. vii, p. 231. 
1861. OHhis, Hall. Fourteenth Ann. Rept. N. Y. State Cab. Nat. Hist., pp. 89, 90. 
1861. Orthis, McChesney. Descriptions New Palaeozoic Fossils, pp. 29, 77. 
1861. Orthis, Hall. Ann. Rept. Geology Wisconsin, pp. 42, 54, 435. 
1862. Orthis, Trematospira ? Hall. Fifteenth Ann. Rept. N. Y. State Cab. Nat. Hist., plate ii. 
1862. Orthis, White and Whitfield. Proc. Boston Society Natural History, vol. viii, p. 292. 
1862. Orthis, A. Winchell. Proc. Acad. Nat. Sci. Phila., vol. xiv, pp. 400, 409. 
1862. Orthis, Strophomena, Billings. Palaeozoic Fossils, vol. i, pp. 76-79, 81-83, 130, 133, 135-137. 
1863. Orthis, Hall. Sixteenth Ann. Rept. N. Y. State Cab. Nat. Hist., pp. 32, 33. 
1863. Orthis, Swallow. Trans. St. Louis Acad. Science, vol. ii, p. 81. 
1863. Orthis, Hall. Transactions Albany Institute, vol. iv, p. 209. 
1863. Orthis, Billings. Geology of Canada; Report of Progress, pp. 129, 130, 165, 167-169, 210, 231, 
312, 369, 384. 
1864. Orthis, Meek. Palaeontology of California, vol. i, p. 10. 
1864. Orthis, A. Winchell. American Journal of Science, vol. xxxvii, p. 228. 
1865. Orthis, Billings. Palaeozoic Fossils, vol. i, pp. 185, 217, 301, 303. 
1865. Orthis, A. Winchell. Proc. Acad. Nat. Sci. Phila., p. 116. 
1865. Orthis, Platystrophia, Shaler. Bull. No. 4, Mus. Comparative Zoology, pp. 65, 67. 
1866. Orthis, Billings. Cat. Silurian Fossils Island Anticosti, pp. 12, 41. 
