CATALOGUE OF TRILOBITES. 313 



ILL^INUS. 



Ectill&nus Salt., 1866 (subgeuus). 

 Hydrolcenus Salt., 1866 (subgeuus). 

 Illcenopsis Salt., 1865 (subgenus). 

 Octillcenus Salt., 1866 (subgenus). 

 Thaleops Con., 1843. 



- VMHIGUUS Foerste, 1885; Bull. Deuison Univ., vol. 1, p. 106, pi. 14, 



figs. 9 a, b; figs. 10 a, b, c; fig. 11. Dayton, Huffman's Quarry, 

 Ohio. Clinton. 



- AMBIGUUS Foerste, 1877; Bull. Deuison Univ., vol. 2, p. 94. 



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



Minnesota, p. 480, fig. 3. 



- AMBIGUUS Foerste, 1889; Proc. Boston Soc. Nat. Hist., vol. 24, p. 267. 



- AMERICAXUS Bill., 1859; Canadian Naturalist, vol. 4, p. 371. Ottawa 



City, Canada. Trenton. 



- AMERICANUS Bill., 1865; Pal. Foss., vol. 1, p. 329, fig. 316 a-d, tig. 318. 



AXGUSTICOLLIS Bill., 1859; Canadian Naturalist, vol. 4, p. 377, fig. 



10 a-d. Island of St. Joseph, Grant's Island, Lake Huron, also 

 at the Falls of La Petite Chaudiere. Trenton. 



- ARCTURUS Hall, 1847; Pal. New York, vol. 1, p. 23, pi. 4 bis, fig. 12. 



Chazy village, N. Y. Chazy and Trenton. 



ARCTURUS Emmons, 1855; Am. Geology, vol. 1, pt. 2, p. 235, pi. 3, 



fig. 12. 



- ARCTURUS (Hall) Bill., 1859; Canadian Naturalist, vol. 4, p. 379. Miu- 



gan Islands. 



- ARCTURUS Bill., 1865; Pal. Foss., vol. 1, p. 279, fig. 265. 



- ARMATUS Hall, 1867; 20th Eep. New York State Cab. Nat. Hist., p. 



330, pi. 22, figs. 1, 2. Bridgeport, Grafton and Racine, Wis. 



Niagara. 



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



418, pi. 22, figs. 1, 2; pi. 25, fig. 22. 



- ARMATUS? Hall, 1875; 28th Rep. New York State Mus. Nat. Hist., pi. 



32, figs. 19, 20. 



- ARMATUS? Hall, 1879; 28th Rep. New York State Mus. Nat. Hist., p. 



189, pi. 32, figs. 19, 20. 



- ARMATUS Hall, 1883; 12th Ann. Rep. Dept. Geol. Nat. Hist. Indiana, 



1882, p. 335, pi. 34, figs. 19, 20; pi. 33, fig. 12. 



- BARRIENSIS (Murch.) Hall; Trans. Albany Inst., vol. .4, p. 227; ab- 



stract, p. 33, May, 1863. 



- BARRIENSIS (Murch.) Roeiner, 1860; Die Sil. Fauna W. Tennessee, p. 



83, pi. 5, fig. 23. Niagara. 



Bumastus BARRIEXSIS (Murch.), 1839; Sil. Syst., p. 6515, pi. 7 his, 



figs. 3 a-d, pi. 14, fig. 7 (in part). 

 BARRIENSIS Salt., JS59; Murchisou's Siluria (2d ed.), pi. 17, figs. 9-11. 



