1899] Lambe — Canadian Paleozoic Corals. 219 



that are circular when free or almost polygonal when crowded to- 

 gether ; it unfortunately does not shew the septa but tabulae are 

 clearly distinguishable. Judging from the manner of growth of 

 C. erratka, the presence of tabular and the stated presence 

 of septa, the writer believes that the description of 

 C. erratica was based on imperfectly preserved specimens of 

 C. r/igosa and that the two species are identical especially in view 

 of the fact that out of a number of examples of the latter species 

 only one shews the septa at all but fortunately in this case very 

 well. 



Trenton fonnatioii ; Lake St. John, Que., Little Discharge, 

 Point Blue, J.Richardson, 1857; near Point Blue, A. R. C. 

 Selwyn and J. Richardson, 1870 ; two miles south of Point Blue, 

 W, McOuat, 1 87 1. All the specimens are silicified and the 

 structure is best seen where weathering has taken place. 



Cyathofhyllum articu latum, Wahlenberg. 



Madreporitcs aiiicidatiis, Wahlenberg. 1821. Nov. Act. Soc. 

 Upsal., vol. VIII, p. 87. 



Cyathophyllniii articulatujii, Milne — Edwards and Haime, 1851. 

 Polyp. P'oss. des Terr. Palaeoz, p. ^yy; and 1855, Brit. P^oss. 

 Corals, p. 282, pi. LXVII, iigs. i, la. 



To this species are assigned a number of specimens from the 

 Niagara rocks of Lake Temiscaming ; their general form, man- 

 ner of growth and structure may be described as follows : — Cor- 

 allum composite, fasciculate, with upright, slightly flexuous, sub- 

 parallel corallites, increasing by lateral or by marginal calicular 

 gemmation from an initial basal parent and forming clusters 

 reachincf a height of over eight inches and of variable breadth. 

 Corallites subcylindrical, strongly expanded and constricted at 

 unequal intervals with generally free thin margins to the expan- 

 sions, coming together and adhering to each other where enlarg- 

 ed, of unequal size, the young corallites often proceeding upward 

 with little increase in diameter, at other times rapidly gaining 

 breadth ; varying in diameter from about 5 to 20 mm., the larg- 



