118 



Ptilodictta Whiteavesii, Ulrich. 



Ptilodictya Whiteavesii, Ulrich.. 1889. Geol. Surv. Canada, Contr. Micro-Palieont. 



Cambro.Silur. rocks, &c., p. 44, pi. VIII., figs. 1, 

 1, a-e. 



Lower beds, T. C. Weston and A. McCharles, 1884 : one comparatively 

 large and two small specimens. 



DiCEANOPOEA FEAGiLis, Billings. (Sp.) 



Pi»7od»c<3/(i /ragfiKs, Billings. .1886. Geol. Surv. Canada, Cat. Lower Silur. Foss. 



Antioosti, p. 9. 

 S'^trtopora/rar/iKs, Whitfield. .1882. Geol. Wiscons., vol. IV., p. 253, pi. 2, fig. 



24. 

 Dicranopora fragilisyVXvich. .\9ii^. Geol. Surv. Canada, Contr. Micro-Palaeont. 



Cambro-Silur. rocks, &c. , p. 40. 



Lower beds, T. C. Weston, 1884: "several segments, more less com- 

 plete." 



DiCEANOPOEA EMACEEATA, Nicholson. (Sp.) 



Ptilodictya emacerata, Nicholson. .1875. Ann. &, Mag. Nat. Hist., Ser. 4, vol. XV., 



p. 179, pi. 14, figs. 5, a-b. 

 ..■Report Geol. Surv. Ohio, vol. II., pt. 2, p. 261, 



pi. 25, figs. 5 and 5, a-h. 

 Dicranopora emacerata, Ulrich. . . 1889. Geol. Surv. Canada, Contr. Micro-PaljEOut. 



Cambro-Silur. rocks, &o., p. 40. 



Lower beds, T. C. Weston, 1884 : "a single imperfect segment." 



GONIOTEYPA BILATBEALIS, Ulrich. 



(f oniotri/pa bitateralis, Vlrich. .ISS9. Geol. Surv. Canada, Contr. Micro- Palfflont. 



Cambro-Silur. rocks, &c., p. 41, figs. 1, 2 and 3, 

 and pi. 9, fig. 1. 



Lower beds, Dr. E. W. Ells, 1875, and T. C. Weston, 1884: seven or 

 eight detached segments. 



Pachydictya hexagonalis, Ulrich. 



Pachydictya hexagonalis, Ulrich.. 1889. Geol. Surv. Canada, Contr. Miero-Pal^ont. 



Cambro-Silur. rooks, &c., p. 42, pi. 9, figs. 2, 2, a-c. 



Lower beds, T. C. Weston, 1884 : one specimen. 



