l86 THE CHICAGO ACADEMY OF SCIENCES. 



1832. Paradoxides boltoni. Green, Monog. Tril. N. A., p. 60, pi. 1,. 

 fig. 5. 



Lockport, N. Y. 



1834. Paradoxides boltoni. Harlan, Trans. Geol. Soc., Penn., vol.. 

 1, pt. 1, p. 103. 



Lockport, N. Y. 

 1838. Platynotus boltoni. Con., Rep. N. Y. St. Geol. Surv., 1838,. 



p. 118. 



1843. Arctinurus boltoni. Castel., Ess. Syst. Sil. 1'Amer. Sept., 

 p. 21, pi. 3, fig. 2. 



Lockport, N. Y. 



1843. Platynotus boltoni. Hall, Geol. N. Y., pt. 4, Tab. Org. Rem.^ 

 19, fig. 1. 



Niagara: Lockport, N. Y. 



1852. Lichas boltoni. Hall, Pal. N. Y., vol. 2, p. 311, pi. 69, and 

 pi. 70, figs, la-g, j-l(not figs. Ih, i=Arctinurus nereus}. 

 Niagara: Lockport, Rochester, Sweden and Walcott, 



N. Y. 



1901. Lichas boltoni. Grabau, Bull. N. Y. St. Mus., No. 45, vol. 9,. 

 p. 225, pi. 17. 



Rochester shale: Niagara, Rochester, etc., N. Y. 

 Arctinurus chicagoensis Weller. 



1907. Arctinurus chicagoensis. Weller, This Bulletin, p. 248, pi. 23,. 

 figs. 7-8, pi. 22, fig. "14. 



Niagaran: Hawthorn, 111. 

 Arctinurus nereus (Hall). 



1852. Lichas boltoni. Hall, Pal. N. Y.', vol. 2, p. 311, pi. 70, figs.. 

 1 h-i. (not figs. 1 a-g, j-1). 

 Niagara: Lockport, N. Y. 



1863. Lichas nereus. Hall, 16th Rep. N. Y. St. Cab. Nat. Hist., 



p. 226. 



1901. Lichas nereus. van Ing., School of Mines Quart., vol. 23,. 

 p. 64. 



Silurian: St. Clair Spring, Independence Co., Ark. 

 Arctinurus obvius (Hall). 



1870. Lichas obvius. Hall, 20th Rep. N. Y. St. Cab. Nat. Hist.,. 

 (rev. ed.), p. 424, pi. 25, fig. 10. 



'Niagara: Lyons, Iowa. 

 Arctinurus occidentalis (Hall). 



1864. Lichas boltoni var., occidentalis. Hall, Trans. Albany Inst.,. 



vol. 4, p. 223. 



Niagara: Waldron, Ind. 



1875. Lichas boltoni. W. & M., Geol. Surv. 111., vol. 6, p. 508, 

 pi. 25, fig. 5. 



Niagara: Graf ton, 111. 



1877. Lichas boltoni var., occidentalis. Hall, 28th Rep. N. Y. St. 

 Mus. Nat. Hist. (doc. ed.), pi. 34, figs. 8-11. 



Niagara: Waldron, Ind. 



1879. Lichas boltoni var., occidentalis. Hall, 28th Rep. N. Y. St. 

 Mus. Nat.-Hist. (mus. ed.), p. 198, pi. 34, figs. 8-11. 

 Niagara: Waldron, Ind. 



