116 



Batostomella gracilis, Ulrich 1889. Geol. Surv. Canada, Coutr. 



Mioro-PaliBont. Cambro-Silur. 



rooks, &;c., vol. I., pt. 2, p. 35. 

 Homotrypdla gracilis, Ulrich 1893. Bryozoa Lower Silur.Minn. 



(in vol. III. Final Bep. Geol., 



and Nat. Hist. Surv. Minn.), 



p. 228. 



Lower beds, T. C. Weston, 1884: "several fragments.'' 



Bythopora delicatula, Nicholson. (Sp.) 



Chcetetes delicatulun, Nicholson. .1875. Rep. Geol. Surv. Ohio, vol. II., pt. 2, p. 199, 



pi. 21, figs. 9 and 9, a. 

 Whiteaves.1880. Geo. Surv. Canada.Rep.Progr. 1878-79, p. 490. 

 BythojMra (/) dfjiratida,\jlrich. 1889. Geol. Surv. Canada, Contr. Micro-Palaeont, 



Cambro-Silur. rocks, &c., p. 36. 



Lower beds, Dr. R. W. Ells, 1875 : one specimen. 



Bythopora striata, Ulrich. 



Bythopora -ttriata, Ulrich . . 1889. Geol. Surv. Canada, Contr. Micro-PalEeout. Cam- 

 bro-Silur. rocks, ifec, p. 36. 



Lower beds, Dr. R. W. Ells, 1875 : one specimen. 



Petigopoea scabiosa, Ulrich. 



Petigopora ■■icabiom, Ulrich. .1889. Geol. Surv. Canada, Coutr. Micro-Palseont. Cam 



bro-Silur. rooks, ifec, p. 34. 



Lower beds, Dr. R. W. Ells, 1875, one specimen, and T. C. Weston, 

 1884, two specimens. 



Monotrypella quadrata, Rominger. (Sp.) 



Oha'tete.i quadrata, Rominger 1866. Proc. Philad. Acad. Nat. Sc, p. 116. 



Chcetetef, rhombicus, Nicholson 1874. Quart. Journ. Geol. Soc. Lond., vol. 



XXX., p. 507, pi. 29, figs. 11, a-b. 



1875. Rep. Geol. Surv. Ohio, vol. II., pt. 2, 



p. 201, pi. 21, figs. 12 and 12, a. 



1876. Ann. & Mag. Nat. Hist. Ser. 4, vol. 



XVIII., p. 86, pi. 5, figs. 1, a-b. 

 Monticulipora rectangularin, Whitfield , , 1878. Ann. Rep. Geol. Surv. Wisoons. for 



1877, p. 70. 

 .1882. Geol. Wiscon., vol. IV., p. 249, pi. 

 11, figs. 11 and 12. 



