l±;(LieRARY|5 



THE OTTAWA NATURALIST. 



Vol. XII. OTTAWA, MARCH, 1899. No. 12. 



ON SOME SPECIES OF CANADIAN PALEOZOIC 



CORALS. 



By Lawrence M. Lambe, F. G. S. 

 (Continued /rom p. 326.) 



To the notes on Canadian fossil corals published in the 

 4)receding part of this volume are added the following, with 

 descriptions of two species that are regarded as new. 



Cyathophyllum Anticostiense, Billings. 



Cyathophylluni Anticostiense, Billings. 1862. Geol. Surv. Canada, 

 Palaeoz. Fossils, vol. I, p. 109. 



" solitarium, Billings. 1866, Geol. Surv. Canada, 



Cat. Silur. Foss. Anticosti, p. 93. 



Corallum simple, of moderate size, cylindro-turbinate, 

 straight or very slightly curved, broadest near the upper end, 

 attaining a length of about 18 cent, with a maximum diameter 

 of over 6*5 cent. Epitheca very thin, preserved only in small 

 patches, shewing indications of the structure beneath. Calyx 

 rather shallow, its sides expanding outward in a gentle convex 

 curve. Internally there is present a narrow tabulate zone, about 

 one-fourth the diameter of the corallite, with a broad combined 

 vesicular and septate zone surrounding it. Tabula; thin, 

 numerous, inosculating, in some coralla bent down at the margin, 

 eight or ten occurring in a space of 5 mm. Septa straight, num- 

 bering from about one hundred to one hundred and twenty, 

 of two definite lengths alternating with each other, one half 

 reaching the centre of the visceral chamber, the remainder 

 stopping short of the tabulae, becoming weak and subordinate to 

 the dissepiments near the peripherx'. Dissepiments strongly 



