CATALOGUE OF TRILOBITES. 315 



ILL^ENUS. 



GRAXDis Bill., 1859; Cauadiaii Naturalist, vol. 4, p. 380. Anticosti. 



Hurison River. 

 HERRiCKi Foerste, 1886; loth Auu. Rep. Geol. Nat. Hist. Minnesota, 



p. 479, fig. 2. Minneapolis, Minnesota. Trenton. 



IMPER.ATOR Hall, 1861; Rej). Progress Geol. Survey Wisconsin, p. 49. 



Niagara. 

 IMPERATOR Hall, 1867; 20tla Rep. New York State Cab. Nat. His., p. 



332, pi. 22, figs. 15-17; pi. 23, figs. 2, 3. Racine and Waukesha. 

 IMPERATOR Hall, 1870; 20th Rep. New York State Cab. Nat. Hist., p. 



420, pi. 22, figs. 15-17; pi. 23, figs. 2, 3. 

 IMPERATOR Whitf., 1882; Geol. Wisconsin, vol. 4, p. 306, pi. 21, figs. 



4, 5. 

 IXCERTUS Bill., 1865; Pal. Foss., vol. 1, p. 332, fig. 319. Stanbridge 



Range 6, lot 20. 

 INDETERMINATUS Wal., 1877; Advanced sheets 31st Rep. New York 



State Mus. Nat. His., p. 19. Russia, N. Y., Plattsville, Wis. 



Trenton. 

 INDETERMINATTS Wal., 1879; 31st Rep. New York State Mus. Nat. 



His., p. 70. 

 INSIONIS Hall, 1867; 20th Rep. New York State Cab. Nat. Hist., p. 



331, figs. 5, 6; pi. 22, figs. 13, 14. Waukesha and Milwaukee, 



Wis. Niagara. 



(Bumnstus) ixsignis Salt., 1867; Mon. Brit. Tril., p. 207. 



ixsKiNis Hall, 1870; 20th Rep. New York State Cab. Nat. Hist., p. 



419, figs. 10, 11; pi. 22, figs. 13, 14. 

 (Bumasius) ixsignis Meek, 1873; Pal. Ohio, vol. 1, p. 189, pi. 15, figs. 



5 a-c. 



ix.siGNis Holm., 1882; De Svenska Art. Tril. Ilhpnus, p. 127. 



IXSIGNIS Whitf., 1882; Geol. Wisconsin, vol. 4, p. .305, pi. 21, figs. 



6-10. 

 ixsiGXis Foerste, 1886; 15th Ann. Rep. Geol. Nat. Hist. Survey Min- 

 nesota, p. 481. 

 loxus Hall, 1867; 20th Rep. New York State Cab. Nat. Hist., p. 378, 



pi. 22, figs. 4-10. cf. Illiejius barrknsis. Racine, etc., Wis. 



Niagara. 

 [Bumastus] loxus Hall, 1870; 20tli Rep. New York State Cab. Nat. 



Hist., p. 420, pi. 22, figs. 4-10. 

 (Bumastus) loxus Hall, 1883; 12th Ann. Reji. Dej). Geol. Nat. Hist. 



Indiana, 1882, p. 335, pi. 38, figs. 13, 14. 



loxrs Whitf., 1882; Geol. Wisconsin, vol. 4, p. 304, pi. 21, figs. 11, 12. 



(Bumastus) loxrs Hall, 1883; Trans. Albany lust., vol. 10, p. 76. 



loxus Foerste, 1889; Proc. Boston Soc. Nat. Hist., vol. 24, p. 268. 



LATiDORSATA Hall, 1847; Pal. New York, vol. 1, p. 230, pi. 60, figs. 



a, b. Near Watertown, N. Y. Trenton. 



