342 



Page 47. 



Line six from top, for "figs. 9, 9 a-d," read — figs. 5, 5 cni. 



Page 48. 



Line nineteen from top, for " 1864 ", read — 1884; and, line seventeen 

 from bottom, for " 1889 ", read— 1890. 



Page 50. 



In the list of synonyms of Favosites Gothlandica, cancel the references 

 to "Billings. 1859. Canad. Journ., N. S., vol. IV, p. 90"; and to 

 "Nicholson. 1874. Rep. Pal. Prov. Ont, p. 45." 



Page 58. 



Line twenty from top, for " this volume, pt. I, pi. 8, fig. 3 a," read — 



this volume, pt. I, pi. 2, fig. 1 ; and pi. 8, fig. 3 a. 

 Line seventeen from bottom, for " Plate 7 fig. 3 a,'' read — Plate 8, 



fig. 3a. 



Page 113. 



" Strkptelasma rusticum, Billings (Sp.) " 

 Mr. Lambe (" Contr. Canad. Palseont., vol. IV, pt. II, p. 114) thinks 

 that these specimens from Stony Mountain should be referred to the 

 Petraia latuscula rather than to the P. rustica of Billings, and that they 

 should be called Streptelasma latuaculum. On the other hand, in an 

 unpublished M.S. list of the fossils collected at that locality by Dr. R. W. 

 Ells in 1875, Mr. Billings refers to the Zapbrentidre as " Petraia, two 

 new sp.," and does not identify any of them with his P. rustica or P. 

 latuscula. 



Page 115. 



For " HoMOTRYPELLA GRACILIS, Nicholson. (Sp.) " — read : — 



Bythopora gracilis, Nicholson. (Sp.) 

 And add to the references : — 



£y(fco;9ora prraci^is, Nickles and Bassler 1900. Bull. U. S. Geol. Surv., No. 173, p. 



185. 



Page 116. 



For " MoNOTRTPELLA QUADRATA, Rominger. (Sp.) " — read : — 



Rhombotrypa QUADRATA, Rominger. (Sp.) 



And add to the references : — 



Rhombotrypa quadrata, Ulrioh & Baseler. ..1904. Smithson. Miscel. Collect. (Quarterly 



Issue) vol. 47, No. 1470, p. 44. 



