UMBE. J CANADIAN PALAEOZOIC CORALS. 23 



" Diaphragms somewhat distant and oblique. Pores large, marginal, 

 causing a pouch-like dilation of the tube wall at the spot where situated. 

 Diameter of tubes in the wider transverse direction varies in different 

 specimens, from a half to one millimeter, which difference in size greatly 

 alters their aspect. The degree of compression of the tubes, their more 

 erect or more prostrate position in various specimens also cause numerous 

 variations in their appearance, but no tangible line between one and another 

 of the forms exists." " It occurs in great abundance in the Niagara 

 group of Drummond Island, at Point Detour, and in other localities." 

 (Rominger.) 



With this species are identified specimens collected by R. Bell, at the 

 north end of Lake Temiscaming, Que., in 1887, by J. B. Tyrrell, in 

 1890, at Grand Rapids, Roche Rouge, Cross Lake Rapids and Chemahawin, 

 all on the Saskatchewan River, in the district of Saskatchewan, by D. B. 

 Dowling, at Grand Rapids, in 1881, and by A. E. Barlow, on the Isle of 

 Mann (Burnt Island) Lake Temiscaming, Que., in 1893. At these localities 

 the rocks are of Niagara age. The large prominent pores mentioned 

 by Rominger are well shown, especially in the specimens from Cross Lake 

 Rapids, where the rock is a light yellow dolomitic limestone, and the 

 coral is preserved so that the coraUites are free of matrix and show the 

 tabulae and septal spines ; in the examples from Lake Temiscaming the 

 structure is best seen in sections. Another specimen was collected at 

 Limestone Rapids, on the Fawn branch of the Severn River, by A. P, 

 Low, in 1886 * 



The coraUites in these particular specimens are irregularly polygonal, 

 scarcely any compression is noticeable and they emerge rather at right 

 angles than obliquely to the surface. A near approach to Favosites is thus 

 seen to occur in a species which shows a considerable variation in structural 

 details on which depend its generic affinities. 



Alveolites Goldfussi, Billings. 



Alveolites Goldfussi, Billings. 1860. Canadian Journal, new series, vol. V., p. 255, fig. 5. 

 II II Nicholson. 1874. Palseon. of Ont., p. 56. 



„ I, Rominger. 1876. GeoL Sur., Mich., p. 42, pi. XVII., fig. 2. 



Hall. 1876. lUus. Dev. Foes., pi. XIV., figs. 5—9. 

 I, II Whiteaves. 1889. Contr. to Can. Palseon., vol. I., pt. II., p. 121. 



Corallum forming discoidal masses with an undote upper surface ; 

 attached by the centre of the basal surface, which is approximately 

 horizontal, uneven and covered by a thin, minutely and concentrically 

 striated epitheca ; sometimes measuring as much as 9 inches across, with 



See foot- note p. 4. 



