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1542. DeWiyrhi (partim), Conrad. Journ. Acad. Nat. Sei.. Philiutelpliia, vol. viii, pp. 2C0. 262. 



1843. Spirifer, Castelkav. Essai sur le Syst. Sil. de rAinerique septentrionale, p. 42. 



1543. OrHiiSy Strophoinaia. Cosrad. Pi-oc. Acad. Nat. Sci., Philadelphia, vol. i, pp. 183, 332, 333. 

 1S43. OitJiis, Dillhyrli.Atrypaf Hall. (Jeolopry of N. Y. ; Kept. Fourth Dist.,pp.70, 71,105, 175, 21."), 



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1844. Ortliis, DeUhyris (partim). Owex. Kept. Geol. Expl. Iowa, Wisconsin and Illinois, plates xii, 



xiv, XV, xvii. 



1845. Uiilii.':, Hall. Amei-ieaii Joninal of Science, vol. xlviii, p. 2i)4. 



1846. Chillis, McCoy. Synopsis Siliii-ian Fossils Ireland, p. 32. 



1847. Orthis, ndtl>y,-is, Leptmm, Hall. PaUrontology of N. Y., vol. i, pp. 20, 1 13, 117, 13i;, 288. 289. 

 1847. Orthis, Yandell asd Shumard. Contribution Geology Kentucky, p. 21. 



1852. Orthis. Owen. Rept. Geol. Surv. Wisconsin, Iowa and Minnesota, p. r)8.5. 



18.52. Orthis, Spirifer, Hall. Palieonlolofry of N. Y., vol. ii, pi>. 56-.58, 65, 2.52-25.5, 260. 



[?] 1855. Orthi.i, Shomard. Rejit. Geol. Surv. Missouri, p. 205. 



1856. Orlhia, BlLLtNciS. Canadian Naturalist and Geolog'ist. vol. i, pp. 40, 134, 136, 205, 206. 



1857. Orthis, Hall. Tenth Ann. Rept N. Y. State Cab. Nat. Hist., pji. 41-46. 102. 110, 135. 



1857. Orthis, Billings. Rept. Prog. Geol. Surv. Canada, p. 296. 

 18.57. Orthis, Cox. Owen's Geol. Surv. Kentucky, vol. iii, p. 570. 



1858. Orthis, Marcoc. Geology of Noith 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. DeUhyris. Roqers. Geology of Penn., vol. ii, part 2, pp. 818, 820. 



1858. OrtMs, Swallow. Trans. St. Louis Acad. Science, vol, i, p. 218. 



1859. Orthis. Billings. Hind's Expl. Assiniboine, Saskatchawan. etc.. p. I'.i3. 



1859. Orthis, Billings. Canadian Naturalist and Geologist, vol. iv, pji. 434-440. 442. 



1859. Orthis. Salter. Cjin.adian Organic Reni.ains. Decade i, p. 39. 



1859. Orthis, Hall. Pala-ontology of N. Y.. vol. iii, pp. 162-172. 174-176, 179, 409, 481. 



1859. Orthi.'i, Strophomemi, Hall. Twelfth Ann. Rept. N. Y. State Cab. Nat. Hist., pi). 66. 7t), 72, 85. 



1860. Orthis. Hall. Thirteenth Ann. Re)it. N. Y. State Cab. Nat. Hist., pp. 78-80, 111, 120, 121. 

 1860. Orthis. SiiiMARD. Triins. St. Louis Acad. Science, vol. i, p. 627. 



1860. Orthis, F. Roomer. 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. Orthis, Hall. Fourteenth Ann. Rejit. N. Y. State Cab. Nat. Hist., pp. 89, 90. 

 1861. Orthis, McChe.sney. Descriptions New Palaeozoic Fossils, pp. 29, 77. 



1861. Orthis, Hall. Ann. Rejrt. Geology Wiscon.'sin, pp. 42, 54, 435. 



1862. Ortfiis, Trematosinra f Hall. Fifteenth Ann. Rept. N. Y. State Cab. Nat. Hist., plate ii. 

 1862. Orthis, White and Whitfield. Pi-oc. Boston Society Nahiral History, vol. viii. p. 292. 

 1862. Orthis, A. Winchell. Proc. Acad. Nat Sci. Phila., vol. xiv, pp. 400, 409. 



1862. 0>-t7iL^, Strophomena, Billings. Pala-ozoic Fossils, vol. i, pp. 76 79, 81-83, 130, 133. 135-137. 



1863. OrthU, Hall. Sixteenth Ann. Rept. N. Y. State Cab. Nat. Hist., pp. 32, 33. 

 1863. 0)i.his, Swallow. Trans. St. Louis Acad. Science, vol. ii, p. 81. 



1863. Orthis, Hall. 'IVan.-=actions 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. Palseontology of California, vol. i, p. 10. 



1864. Orthis, A. Winchell. American Joui'nal of Science, vol. xxxvii, p. 228. 



1865. Orthis, Billings. Paleozoic Fossil.s, vol. i, pp. 185, 217, 301, 303. 

 1865. Orthis, A. Winchell. Proc. Acad. Nat. Sci. Phila., p. 116. 



1865. Orth'is, PlatystropMa, Shaler. Bull. No. 4, Mus. Comparative Zoology, pp. 65, 67. 



1866. Ortliis, Billings. Cat. Silurian Fossils Island Anticosti, pp. 12, 41. 



