676 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Isotelus beta Raymond. 



Asaphus sp. beta Raymond, Ann. Carnegie MUB., 3, 1905, p. 342, pi. 12, fig. 9. 

 Isotelus beta Raymond, 7th Rep. Vermont State Geol., 1910, pi. 36, fig. 9, pi. 39, 



figs. 4-7; Ann. Carnegie MUB., 7, 1910, p. 67, pi. 19, figs. 4-7. 

 Chazyan (Crown Point, Valcour): Crown Point, Valcour Island, Platteburgh, and 

 Chazy, New York. 



Isotelus canalis Hall. 



Isotelus canalis (Conrad MS.) Hall, Pal. New York, 1, 1847, p. 25, pi. 4 (bis), 



figs. 17-19. Emmons, Amer. Geology, 1, pt. 2, 1855, p. 236, pi. 3, figs. 17-19. 



Asaphus canalis Hall, 12th Rep. New York State Cab. Nat. Hist., 1859, p. 70 



(gen. ref.). Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 270, figs. 255a, 



b; p. 352, fig. 340. 



Chazyan: Chazy, New York; Newfoundland. 

 Observation. Neither defined nor figured so as to be recognized. 



ISOTELUS CANALIS Clarke. See Isotelus gigas. 



ISOTELUS CANALIS Grabau and Shimer. See Isoteloides whitfieldi. 



ISOTELUS CANALIS Weller. See Asaphellus gyracanthus. 



Isotelus coYingtonensis Ulrich. 



Isotelus covingtonensis Ulrich in Foerste, Jour. Cincinnati Soc. Nat. Hist., 21, 



1914, p. 145, figs. 1, 2. 

 Trenton (Upper): Covington, Rogers Gap, etc., Kentucky. 



Isotelus cyclops Green. 



Isotelus cyclops Green, Monthly Amer. Jour. Geol., 2, 1832, p. 560, pi., fig. 7; 



Mon. Tril. N. A., 1832, p. 69, fig. 7, cast 24. 

 Middle Ordovician: Western New York. 

 Plastotype.C&t. No. 25703, U.S.N.M. 



ISOTELUS EMORYI Walcott. See Onchometopus emoryi. 

 ISOTELUS FLORENCEVILLENSIS Calvin. See Onchometopus susae. 

 ISOTELUS GIGAS of authors. See Isotelus jacobus, I. latus, and I. iowensis. 



Isotelus gigas deKay. 



Isotelus gigas DeKay, Annals Lyceum Nat. Hist. New York, 1, 1824, p. 176, pi. 

 12, fig. 1; pi. 13, fig. 1. Green, Monthly Amer. Jour. Geol., 1832, p. 560; Mon. 

 Tril. N. A., 1832, p. 71, cast 21, 22. Milne-Edwards, Crust., 3, 1840, p. 298. 

 Troost, 5th Geol. Rep. Tennessee, 1840, p. 57. Vanuxem, Nat. Hist. New 

 York, Geol., 3, 1842, p. 47, fig. 1. Emmons, ibid., 2, 1842, p. 389, fig. 1. 

 Mather, ibid., 1, 1843, p. 397, fig. 1. Goldfuss, Neues Jahrb. f. Min., etc., 

 1843, p. 554. Owen, Amer. Jour. Sci., 47, 1844, p. 363, fig. 1. Hall, Pal. 

 New York, 1, 1847, p. 25, pi. 4 (bis), fig. 16; p. 231, pi. 60, figs. 7a-i; pi. 61, 

 figs. 3a-f, 3i-m, 4a-c; pi. 62, figs, la-c, 2; pi. 63; also p. 254, pi. 66, fig. 5. 

 Emmons, Amer. Geology, 1, pt, 2, 1855, p. 215, pi. 16, figs. 9-12. Billings, 

 Canadian Nat. Geol., 1, 1856, pp. 45, 46, figs. 9, 11. Rogers, Geol. Pennsyl- 

 vania, 2, pt. 2, 1858, p. 819, fig. 610. Emmons, Man. Geol., 1860, p. 100, 

 fig. 89. Lincklaen, 14th Rep. New York State Cab. Nat. Hist., 1861, pi. 3, 

 fig. 11. Hitchcock, Geol. Vermont, 2, 1862, pi. 12, fig. 5. Chapman, Expos. 

 Min., Geol. Canada, 1864, p. 136, fig. 140. Lesley, Geol. Surv. Pennsylvania, 

 Rep. P 4, 1889, p. 302, figs. Clarke, Geol. Minnesota, 3, pt 2, 1894, p. 701, 

 figs. 6-8; p. 706. Schuchert, Proc. U. S. Nat. Mus., 22, 1900, p. 174. Weller, 

 Geol. Surv. New Jersey, Pal., 3, 1903, p. 192, pi. 14, figs. 6, 7. Grabau and 

 Shimer, N. A. Index Fossils, 2, 1910, p. 292, fig. 1601. Raymond, Ann. 



