THE NATURAL HISTORY SURVEY. 2OI 



1877. Homalonotus delphinocephalus ? Hall. 28th Rep. N. Y. St. 

 Mus. Nat. Hist. (doc. ed.), pi. 32, figs. 17-18. 



Niagara: Waldron, Ind. 



1879. Homalonotus delphinocephalus. Hall, 28th Rep. N. Y. St. 

 Mus. Nat. Hist. (mus. ed.), p. 187, pi. 32, figs. 17-18. 



Niagara: Waldron, Ind. 



1882. Homalonotus delphinocephalus. Hall, llth Rep. Dep. Geol. 

 and Nat?. Hist., Indiana, p. 332, pi. 34, figs. 17-18. 



Niagara: Waldron, Ind. 



1901. Homalonotus delphinocephalus. Grabau, Bull. N. Y. St. 

 Mus., No. 45, vol. 9, p. 221, fig. 153. 



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

 Homalonotus giganteus Castel., see Homalonotus delphinocephalus 



(Green). 



Homalonotus herculaneus Castel., see Homalonotus delphinocephalus 

 (Green). 



ILLAENOIDES Weller, 1907. 

 Illaenoides triloba Weller. 



1907. Illaenoides triloba. Weller, This Bulletin, p. 226, pi. 17, figs. 

 6-9, pi. 19, figs. 12-14. 



Niagaran: Bridgeport, Joliet, and near 'Lemont, 111. 



ILLAENUS Dalm.,' 1826. 

 Illaenus aboynensis Whiteaves. 



1895. Illaenus aboynensis. Whiteaves, Geol. Surv. Can., Pal. 

 Foss., vol. 3, pt. 2, p. 108, pi. 15, figs. 7-8. 



Guelph: Aboyne, Ont. 

 Illaenus ambiguus Foerste. 



1885. Illaenus ambiguus. Foerste, Bull. Sci. Lab. Den. Univ., 

 vol. 1, p. 106, pi. 14, figs. 9a-9b, lOa-lOc, 11. ' 



Clinton: near Dayton, Ohio. 



1887. Illaenus ambiguus. Foerste, 15th Ann. Rep. Geol. and Nat. 

 Hist. Surv. Minn., p. 480, fig. 3, p. 478. 



Niagara: Miffintown, Penn. 



1887. Illaenus ambiguus. Foerste, Bull. Sci. Lab. Den. Univ., 

 vol. 2, p. 94. 



Clinton: Near Dayton, Ohio. 



1890. Illaenus ambiguus. Foerste, Proc. Bost. Soc. Nat. Hist, 

 vol. 24, p. 267. 



Clinton: Hanover, Ind. 



1895. Illaenus ambiguus. Foerste, Geol. Surv. Ohio, vol. 7, p. 

 525, pi. 26, figs. 9a-9b, lOa-lOc, 11. 



Clinton: Ohio; Hanover, Ind. 

 Illaenus armatus Hall. 



1865. Illaenus armatus. Hall, Adv. Sheets, 18th Rep. N. Y. St. 

 Cab. Nat. Hist., p. 26, figs. 3-4. 



Niagara: Bridgeport, 111., Grafton and Racine, Wis. 

 1865. Illaenus (Bumastus) worthenanus. W. & M., Mem. Bost. Soc. 

 Nat. Hist., vol. 1, p. 105. 

 Niagara: Bridgeport. 111. 



