CATALOGUE OF TRILOIUTES. 313 



ILL.ENUS. 



Ectillwnus Salt., 1866 (sub<,'euus). 

 Hydrohcnus Salt., 1866 (siibgeuus). 

 Ilhmopsis Salt., 186.) (subgenus). 

 Octillrenus Salt., 1866 (sul)geuus). 

 Thaleopft Cou., 1843. 



A.MBiGcrus Foerste, 188-5; Ball. Deuisou Uuiv., vol. 1, p. 106, pi. 14, 



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

 Ohio. * Clintou. 



.-VMBIGUU.S Foerste, 1877; Bull. Deuisou Uuiv., vol. 2, \). 94. 



AMBiGUUS Foerste, 1886; loth Aun. Eep. Geol. Nat. Hist. Survey 



Minnesota, p. 480, fig. 3. 



AMBIG0US Foerste, 1889; Proc. Boston Soc. Nat. Hist., vol. 24, p. 267. 



AMERiCANus Bill., 1859; Cauadian Naturalist, vol. 4, p. 371. Ottawa 



City, Canada. Treuton. 



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



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



10 a-d. Island of St. Joseph, Graufs 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. 

 ARCTCRUS Emmons, 1855; Am. Geology, vol. 1, j^t. 2, p. 235, pi. 3, 



fig. 1-2. 

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



gan Islands. 



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



\RMATUS Hall, 1867; 20th Kep. New York State Cab. Nat. Hist., p. 



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



Niagara. 



ARMATUs Hall, 1870; 20th Eep. New York State Cab. Nat. Hist., p. 



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

 ARM.A,TUS? Hall, 1875; 28th Eep. New York State Mus. Nat. Hist., pi. 



32, figs. 19, 20. 

 .\RMATUS? Hall, 1879; 28th Eep. New York State Mus. Nat. Hist., p. 



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



ARMATUS Hall, 1883; 12th Aun. Eep. 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 (Muroh.) Eoemer, 1860; Die Sil. Fa\iua W. Tennessee, p. 



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



Bumcuitua BARRiEXSis (Murch.), 1839; Sil. Syst., p. 05G, pi. 7 hh, 

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



BARRIENSIS Salt., 1859; Murchisou's Siliiria (2d ed.), pi. 17, figs. 9-11. 



