*H,TE«E8.J FOSSILS OP HAMILTON FORMATION OF ONTARIO. 377 



-with Intrapora, and that C. elegantula is probably identical with /. 

 cosciniformis. 



OOSCINIUM STRIATUM, Hall. 



Coscinium striatum. Hall. 1887. Pal. N. York, vol. VI., p. 238, pi. 64, figs. 13-16. 



"Hamiltou group, Widder, Ontario, Canada." Hall. A well pre- 

 served and very characteristic specimen of this species, in the Museum 

 of the Survey, was collected at the same locality by Rev. J. M. Good- 

 willie in 1882. 



Cystodiotya Meeki, Nicholson. (Sp.) 



Ptilodictyii Mccki, Nicholson. 1874. (leol. Mag., N.S., vol. I., p. 123; and Rep. 



Pal. Prov. Ontario, p. 97, and figs. 34 a-c on p. S8. 

 Ci/stodictiia 3Iccki, Ulrich. 1890. Geol. Surv. Illinois, vol. VIII., p. 492. 



" Rare in the Hamilton formation of Bartlett's Mills, near Arkona." 

 Nicholson. Thedford, Rev. Hector Currie, 1882. 



Cystodiotya incisurata, Hall. (Sp.) 



Stictopora incisurata. Hall. 1881. Trans. Albany Inst., vol. X., p. 189. 



1884. Rep. St. Geologist for 1883, p. 38. 



1887. Pal. N. York, vol. VI., p. 241, pi. 60, figs. 1-18. 

 Ci/stodictiia incisurata, Ulrich. 1890. Geol. Surv. Illinois, vol. VIII., p. 492. 



Thedford, in the " Lower third of the section," three specimens 

 (No. 26, .546 of the United States National Museum Catalogue of Inverte- 

 brate Fossils) collected in 1895, and determined by Mr. Schuchert. 



Cy'STODICTYA reotilinea, Hall. (Sp.) 



Stictopora rcctalinea. Hall. 1887. Pal. N. York, vol. VI., p. 245, pi. 63, fig. 23. 

 Cystodictya rcctalinea, Ulrich. 1890. Geol. Surv. Illinois, vol. VIII., p. 492. 



"Hamilton group, West Williams, Ontario, Canada." Hall. 

 Cystodiotya (?) incrassata, Hall. 



Stictopora incrassata, Hall. 1881. Trans. Albany Inst., vol. X., p. 190. 

 1884. Rep. St. Geologist for 1883, p. 47. 

 1887. Pal. N. York, vol. VI., p. 249, pi. 6.3, fig. 23. 



"Hamilton group, West Williams, Province of Ontario, Canada." Hall. 

 Semiopora bistigmata, Hall. 



Semiopora bistigmata, Hall. 1881. Trans. Albany Inst., vol. X., p. 193. 

 1884. Rep. St. Geologist for 1883, p. .51. 

 1887. Pal. N. York, vol. VI., p. 262., pi. 62, figs. 27-29. 



"Hamilton group, West Williams, Ontario, Canada." Hall. 

 2 



