2IO 



THE CHICAGO ACADEMY OF SCIENCES. 



1867. Sphaerexochus romingeri. Hall, 20tH Rep. N. Y. St. Cab. 

 Nat. Hist., p. 375, t pl. 21, figs. 4-7. 



Niagara : Wisconsin and Illinois. 



1870. Sphaerexochus romingeri. Hall, 20th Rep. N. Y. St. Cab. 

 Nat. Hist. (rev. ed.), p. 425, pi. 21, figs. 4-7. 



Niagara: Wisconsin and Illinois. 



1875. Sphaerexochus romingeri. W. & M., Geol. Surv. 111., vol. 7, 

 p. 510, pi. 24, fig. 4. 



Niagara: Joliet, 111. 



1882. Sphaerexochus romingeri. Whitf., Geol. Wis., vol. 4, p. 311, 

 pi. 21, figs. 1-3. 



Niagara: Racine and Waukesha, Wis. 



1888i Sphaerexochus mirus. Foerste, Bull. Sci. Lab. Den. Univ., 

 vol. 3, p. 121, pi. 13, fig. 6. 



Guelph: Cedarville, Ohio. 



1901. Sphaerexochus romingeri. van Ing., School of Mines Quart., 

 vol. 23, p. 35 (no description). 



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

 . 1904. Sphaerexochus romingeri. Kindle, 28th Ann. Rep. Dep. 

 Geol. and Nat. Res., Indiana, p. 483, pi. 22, figs. 8-9, 12-15. 



Niagara: Northern Indiana. 



1907. Sphaerexochus romingeri. Weller, This Bulletin, p. 266, pi. 

 24, figs. 16-19. 



Niagaran: Bridgeport, Lernont, Romeo, Joliet, etc., 111. 



STAUROCEPHALUS Barrande, 1846. 

 Staurocephalus murchisoni Barr. 



1891. Staurocephalus murchisoni. van Ing., School of Mines Quart., 

 vol. 23, p. 35 (no description). 



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

 Staurocephalus obsoleta Weller. 



1907. Staurocephalus obsoleta. Weller, This Bulletin, p. 270, pi. 

 24, fig. 15. 



Niagaran: Near Lemont, 111. 



.TRIMERUS Green, 1832. 

 Trimerus delphinocephalus Green, see Homalonotus delphinocephalus 



(Green.) 



