316 CALIFORNIA ACADEMY OF SCIENCES. 



ILL^ENUS. 



- MADISOXIANUS Whitf., 1882; Geol. Wisconsin, vol. 4, p. 307, pi. 20, 



figs. 8, 9. Locality not given. (See P. niagarensis.) Niagara. 



MADISONIANUS Foerste, 1885; Bull. Denison Univ., vol. 1, p. 106, pi. 



14, figs. 1 a, b and 2 a, b. Soldiers' Home Quarry, Ohio. 



MADISONIANUS Foerste, 1887; Bull. Denison Univ., vol. 2, p. 93, pi. 



8, figs. 8-10. Clinton. 



- MILLERI Bill., 1859; Canadian Naturalist, vol. 4, p. 375, fig, 10. City 



of Ottawa, etc., Canada. Trenton. 



MILLERI Wai., 1877; Advanced sheets 31st Eep. N. Y. State Mus. 



Nat. Hist., p. 20. Kussia, N. Y., and Plattsville, Wis. 



- MILLERI Wai., 1879; 31st Kep. N. Y. State Mus. Nat. Hist., p. 71. 



(Nileus) MINNESOTENSIS Foerste, 1886; 15th Ann. Kep. Geol. Minne- 



sota, p. 478, fig. 1. Minneapolis, Minnesota. Trenton. 



niagarensis Whitf., 1880; Ann. Kep. Geol. Wisconsin, 1879, p. 68. 



Name changed by request of the Wisconsin Geological Survey, 

 from Illcenus niagarensis to IllcKnus madisonianus. Explanation 

 omitted in the Final Keport Pal. Wisconsin, p. 307. Niagara. 



ORBICAUDATUS Bill., 1859; Canadian Naturalist, vol. 4, p. 379. Gemache 



Bay, Auticosti. Hudson. 



Thaleops OVATUS Con., 1843; Proc. Acad. Nat. Sci. Phila., vol. 1, p. 



332. Trenton. 



Thaleops (Illcunus) OVATUS Hall, 1847; Pal. New York, vol. 1, p. 259, 



pi. 67, figs. 6 a-b. Mineral Point, Wis. 



- OVATUS Whitf., 1882; Geol. Wisconsin, vol. 4, p. 238, pi. 5, figs. 1, 2. 



Beloit, Wis. 



PTEROCEPHALUS Whitf., 1878; Ann. Kep. Geol. Wisconsin, 1877, p. 87. 



Pewaukee, Wis. Niagara. 



- PTEROCEPHALUS Whitf., 1882; Geol. Wisconsin, vol. 4, p. 309, pi. 20, 



figs. 10-12. 



STIMULATOR Bill., 1865; Pal. Foss., vol. 1, p. 337, figs. 315 a, b. Stan- 



bridge Kange 6, lot 20. 



TAURUS Hall, 1861; Kep. Prog. Geol. Survey Wisconsin, p. 49. Beloit, 



Mineral Point, Wis.; Kockford, Illinois. Niagara. 



- TAURUS M. & W., 1865; Geol. Survey Illinois, vol. 3, p. 320, pi. 3, 



fig. 2. 

 Bumastus TRENTONENSIS Emmons, 1842; Geol. New York, 3d Geol. 



Dist., p. 390, fig. 1. Hogansburg, Franklin, N. Y. Trenton. 



Bumastus TRENTONENSIS, 1854; 7th Rep. New York State Cab. Nat. 



Hist., p. 64, fig. 1. 

 (Bumastus) TRENTONENSIS Emmons, 1855; Am. Geology, vol. 1, pt. 



2, p. 315, pi. 15, fig. 13. 



TRENTONENSIS Hall, 1847; Pal. New York, vol. 1, p. 230, pi. 60, fig. 5. 



- TUMIDIFRONS Bill., 1865; Pal. Foss., vol. 1, p. 278, fig. 264. Cow Head, 



N. F. 



