THE NATURAL HISTORY SURVEY. 2O/ 



Metopolichas pugnax (W. & M.)- 



1865. Lichas pugnax. W. & M., Mem. Bost. Soc. Na,t. Hist., vol. 



1, p. 103, pi. 3, figs.'lOa-c. 

 Niagara: Bridgeport, 111. 



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

 (rev. ed.), p. 424, pi. 25, fig. 20; also p. 433. 



Niagara: Bridgeport, 111. 



1907. Metopolichas pugnax. Weller, This Bulletin, p. 242, pi. 21, 

 figs. 1-4. 



Niagaran: Bridgeport, 111. 



ODONTOPLEURA Emm., 1839. 



Odontopleura illinoiensis Weller. 



1907. Odontopleura illinoiensis. Weller, This Bulletin, p. 253, pi. 23, 

 figs. 5-6. 



Niagaran: Near Joliet, 111. 

 Odontopleura ortoni (Foerste). 



1885. Acidaspis . Foerste, Bull. Sci. Lab. Den. Univ., vol. 1, 



p. 101, pi. 13, fig. 23. 



Clinton: New Carlisle, Ohio. 

 1887. Acidaspis ortoni. Foerste, Bull. Sci. Lab. Den. Univ., vol. 



2. p. 90, pi. 8, fig. 1. 



Clinton: Near New Carlisle, Ohio. 



1895. Acidaspis ortoni. Foerste, Geol. Surv. Ohio, vol. 7, p. 522, 

 1 pi. 25, fig. 23, pi. 27, fig. 1. 



Clinton : Ohio. 



1901. Odontopleura ortoni. van Ing., School of Mines Quart., vol. 

 23, p. 39. 



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

 1904. Odontopleura ortoni. Kindle, 28th Ann. Rep. Dep. Geol. 

 and Nat. Res., Indiana, p. 481, pi. 24, figs. 16-19. 



Niagara: Georgetown and Pendleton, Ind. 

 Odontopleura arkansana van Ingen. 



1901. Odontopleura arkansana. van Ing., School of Mines Quart., 

 vol. 23, p. 40, fig. 9. 



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



PHACOPS Emm., 1839. 



Phacops handwerki Weller. 



1907. Phacops handwerki. Weller, This Bulletin, p. 271, pi. 24, 

 figs. 6-7. 



Niagaran: Near Lemont, 111. 



Phacops limulurus (various authors), see Dalmanites limulurus (Green). 

 Phacops pulchellus Foerste. 



1885. Arionellus . Foerste, Bull. Sci. Lab. Den. Univ., vol. 



1, p. 114, pi. 14, fig. 3. 



Clinton: Near Dayton, Ohio. 



1887. Phacops pulchellus. Foerste, Bull. Sci. Lab. Den. Univ., 

 vol. 2, p. 99, pi. 8, figs. 4, 20, 21. 

 Clinton: Near Dayton, Ohio. 



