CATALOGUE OF TRILOBITES. 275 



ASAPHUS. 



Isotelus gigas Gieeu, 1832; Monthly Am. Jour. Geol., p. 560. 

 Isotelus gifjas Green, 1832; Mon. Tril. N. A., p. 71, casts 21, 22. 

 Isotelus planus Greeu, 1832; Monthly Am. Jonr. Geol., p. 560; 



Mon. Tril. N. A., p. 68, cast 23. 

 Isotelus stego2)s Greeu, 1832; Mon. Tril. N. A., p. 71, casts 26, 27. 

 Brongniartia isotdea Eaton, 1832; Geol. Text Book, ]}. 33, pi. 2, 

 fig. 22. 



PL.-VTYCEPHALU-s Brouu, 1835; Lethsea Geogu., vol. 1, p. 115, pi. 9, fig. 8. 



Syu., Isotelus gigas Milne-Edw., 1840; Crust., vol. 3, p. 298. 



PLATYCEPHALUS Buckl., 1840; Bridgw. Treatise, vol. 2, p. 76, pi. 63, 



fig. 12. 



PLATYCEPHALUS Burm., 1843; Org. Trilobites, j). 110, pi. 2, fig. 12 



(Kay Soc. ed., 1846). 

 Syn., Isotelus gigas Portl., 1843; Geol. Kep. Londonderry, p. 295, pi. 

 7, fig. 1; pi. 8, fig. 1. 

 Isotelus planus Portl., 1843; Geol. Kep. Londonderry, j). 295, 



pi. 7, figs. 2, 3. 

 Isotelus gigas Hall, 1847; Pal. New York, vol. 1, p. 231, plij. 60-63. 

 Isotelus gigas Emmons, 1855; Am. Geol., vol. 1, pt. 2, p. 215, 

 pi. 16, fig. 12. 

 Isotelus PLATYCEPH.ALUS Roemer, 1851-56; Lethiea Geogn., vol. 1, p. 

 632, pi. 9, fig. 8; pi. 9', fig. 5. 



PLATYCEPHALUS Nieszk., 1857; Mon. Sil. Ostseeprovinz, Tril., p. 37. 



Syn., Isotelus gigas Kogers, 1858; Geol. Survej' Pennsylvania, vol. 2, 

 p. 819, fig. 610. 



PLATYCEPHALUS Bill , 1863; Geol. Survey Canada, p. 184, fig. 183. 



Syn., Asajjhus {Isotelus) gigas Salt., 1864; Mon. Brit. Tril., p. 161, pi. 

 24, figs. 1-5; pi. 25, fig. 1 (var.) 

 Asaphus (Iso(elus) gigas Salt., 1864; Mem. Geol. Survey United 

 Kingdom, decade xi, pi. 3. 



PLATYCEPHALUS Bill., 1870; Quart. Jour. Geol. Soc. London, vol. 



26, p. 486, pis. 31, 32. 

 Syn., Isotelus gigas Miller, 1874; Cincinnati Quart. Jour. Sci., vol. 1, 

 p. 138. 

 platyleurus Green, 1837; Am. Jour. Sci., 1st series, vol. 32, p. 169. 



(See Dabnanitis platyleurus.) 

 POLYPLEURUS Green, 1838; Am. Jour. Sci., 1st series, vol. 34, p. 380. 



On the banks of the Mississippi, near the mouth of Des Moines 



Kiver. 

 QUADRATiCAUDATU.s Bill., 1865; Pal. Foss., vol. 1, p. 272, fig. 258. 



Table Head, N. F. 



iiCEMiNOERi Wal., 1876; 28th Rep. New York State Mus. Nat. Hist., 



p. 96. Russia. Herkimer county, N. Y.; Qnimby's Mill, Lafayette 

 cininty. Wis. Trenton. 



