136 CONTRIBUTIONS TO CANADIAN PAL/EONTOLOGY. 



sizes, the primaries passing quite to or nearly to the centre of the visceral 

 chamber, in the latter case leaving the tabulae smooth at the centre, the 

 secondaries small, reaching generally less than half way to the centre. 

 Tabulas forming a definite central zone equal in breadth to about half the 

 diameter of the corallite, flat or slightly concave, often deflected at the 

 margin. Dissepiments, as a whole, rather small but unequal in size, 

 occupying the interseptal spaces between the tabulae and the outside wall, 

 encroaching at times on the tabulae. Calyces moderately deep, with 

 steeply ascending sides and most often with expanded thin margins. 



"In the description given by Milne- Edwards and Haimeof this species 

 (Brit. Foss. Corals) the septa are stated to be 'about sixty in number, thin, 

 equally developed.' This is evidently a misprint as far as the equality of 

 the septa is concerned, as in fig. la supplementing the description, the 

 septa are shown as of two orders, numbering in all about sixty, half of 

 which almost reach the centre of the visceral chamber, whilst the re- 

 mainder are only about half that size." (Lambe, 1899.) 



Localities. — "The Forks," Scaumenac River, Que., R. D. Ells, 1883, 

 and Isle of Man (Burnt Island), Lake Temiscaming, Que., A. E. Bar- 

 low, 1893 : Niagara formation. In 1880, Col. C. C. Grant collected at 

 Hamilton, Ont., in rocks belonging to the Clinton formation a coral that 

 is thought to belong to this species. 



Cyathophyllum Wahlenbeegi, Billings. 

 Plate XI., figs. 2, 2a, 2b. 



Cyaihophyllum Wahlenbergii, Billings. 1862. Palieoz. Foss., vol. I., p. 108. 

 Cyathophyllum Wahlcnbergi, Billings. 1866. Cat. Sil. Foss. of Anticosti, p. 34. 



Corallum composed of an aggregation of long, cylindrical, upright, 

 slightly flexuous corallites that increase by lateral calicinal gemmation 

 and are so close together as to touch each other or to be separated by 

 spaces generally less than their own diameter ; found in colonies measur- 

 ing 30 cent, or more across. As many as three or four buds at a time 

 sometimes produced by the parent cells. Surface of corallites roughened 

 by frequent and sudden annular constrictions and enlargements at irregu- 

 lar intervals. Bpitheca marked transversely by faint lines of growth and 

 longitudinally by depressed lines indicating the position of the septa 

 within. 



Inner structure consisting of well defined septa, of vesicles partly 

 filling the interseptal spaces, and of tabulae forming a central area. Septa 

 numbering about forty-two, of two sizes alternating with eauh other, the 

 larger passing almost or quite to the centre of the corallites, the remainder 



