662 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Illeenus angusticollis Billings. 



Illsenus angusticollis Billings, Canadian Nat. Geol., 4, 1859, p. 376, fig. 10; Geol. 

 Canada, Geol. Surv. Canada, 1863, p. 151, fig. 113a-d. Raymond and Nar- 

 raway, Ann. Carnegie Mus., 4, 1C08, p. 245, pi. 61, figs. 1-5. Grabau and 

 Shimer, N. A. Index Fossils, 2, 1910, p. 294. 



Black River: Island of St. Joseph, Grants Island, Lake Huron; La Petite Chau- 

 diere, Hull, Canada. 



ILL^JNUS ARCTURUS Hall. See Thaleops arcturus. 



Illaenus arcuatus Billings. 



IllEenus arcuatus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 279, fig. 265. 

 Chazyan (Quebec-P): Cow Head, Newfoundland. 



Illaenus argentinus Kayser. 



Illsenus argentinus Kayser, Zeits. d. d. geol. (resell., 49, 1897, p. 283, pi. 7, figs. 



8,9. 

 Ordovician: East of Jachal, San Juan, Argentina. 



ILL^NUS ARMATUS Hall. See Bumastus armatus. 



ILL^NUS (BUMASTUS) BARRIENSIS Hall. See Bumastus ioxus. 



Illsenus bayfleldi Billings. 



Illsenus Bayfieldi Billings, Canadian Nat. Geol., 4, 1859, p. 369, figs. 4-6; Geol. 



Canada, Geol. Surv. Canada, 1863, p. 133, fig. 65a-c. Raymond, Ann. 



Carnegie Mus., 3, 1905, p. 348, pi. 13, figs. 11, 12; 7th Rep. Vermont State 



Geol., 1910, pi. 35, figs. 11, 12. 

 Chazyan (Mingan): Mingan Islands, Canada. 



ILL^NUS CHICAGOENSIS Weller. See Bumastus chicagoensis. 

 CLAVIPRONS Billings. See Thaleops clavifrons. 



Illaenus conifrons Billings. 



Illsenus conifrons Billings, Canadian Nat. Geol., 4, 1859, p. 378, fig. 11; Geol. 



Canada, Geol. Surv. Canada, 1863, p. 151, figs. Ilia, b. 



Hydrolaenus conifrons Salter, Mon. British Tril., Pal. Soc., 1867, p. 182 (gen. ref.). 

 Chazyan (Mingan) : Mingan Islands, Canada. 



Illaenus conradi Billings. 



Illsenus Conradi Billings, Canadian Nat. Geol., 4, 1859, p. 372, figs. 7-9; Geol. 

 Canada, Geol. Surv. Canada, 1863, p. 151, figs. 110a-c. Vogdes, Occ. Papers 

 California Acad. Sci., No. 4, 1893, p. 330. Raymond and Narraway, Ann. 

 Carnegie Mus., 4, 1908, p. 245, pi. 60, figs. 9, 10. 



Black River (Leray) : Falls of La Petite Chaudiere, vicinity of Ottawa, Canada. 



Illaenus consimilis Billings. 



Illaenus consimilis Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, pp. 277, 



figs. 263a-c, 317, 318a. Grabau and Shimer, N. A. Index Fossils, 2, l( 



p. 294, fig. 1604a. 

 Chazyan (Quebec L, M, N): Point Rich and Table Head, Newfoundland. 



Illaenus consobrlnus Billings. 



Illaenus consobrinus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 280, 



266a, b; p. 332, footnote, figs. 320a-c. 

 Chazyan (Quebec P): Cow Head, Newfoundland. 



