"-Ambe. ] CANADIAN PALEOZOIC CORALS. 51 



are not so crowded, or are comparatively distant from each other, as in 

 Goldfuss's figure. 



A favourite place for the commencement of the growth of the corallum, 

 as is evinced by the Lake Temiscaming examples, was the rounded upper 

 surface of hemispherically shaped masses of Favosites. 



Formation. — Niagara. 



Syringopora bifurcata, Lonsdale. 



Syringopora bifurcata, Lonsdale. 1839. Murch. Sil. Sys., p. 685, pi. 15 bis. figs. 11, 

 11a, 116. 



Growing in masses composed of upright, slightly geniculated corallites 

 averaging 1 J line in diameter and at times nearly as much as 3 lines 

 apart. The geniculations of the corallites are on an average about 5 

 lines apart, and on account of these changes in the direction of their 

 growth, the corallites are frequently brought almost into contact with 

 each other. Connecting bars or tubes, stout, short, occurring at the geni- 

 culations or where the corallites are close together, or if the corallites are 

 comparatively strait and parallel to each other, about 3 or 4 lines apart. 

 The outer surface of the corallites is roughened by moderately strong but 

 irregular annulations. In other respects this species presents nothing 

 unusual in its structure. 



Niagara formation. — Cape Wingfield, Lake Huron. A. Murray. 

 1861 ; Isle of Mann (Burnt Island), Lake Temiscaming, Que. A. E. 

 Barlow. 1893. 



Lower Helderberg group.-— L'Anse a la Vieille, Que. R. Bell. 1862 

 (identified by E. Billings) ; " The Forks " Scaumenac River, Que., and 

 1 mile east of the Little Cascapedia River, Que., R. W. Ells. 1883. 



Syringopora Dalmanii, Billings. 



Plate II., fig. 2. 



Syringopora Dalmanii, Bill. 1858. Rep. of Progress, for 1857, Geol. Survey of Canada, 

 p. 169. 



" Forming large masses ; corallites long, sub-parallel, slightly radiating, 

 occasionally a little flexuous, annulated, one line or rather more in dia- 

 meter, distant usually half a line, occasionally in contact or where 

 flexures occur, more than one line apart ; connecting processes very short, 

 about two lines distant." (Billings.) 



This species differs from Syringopora bifurcata, Lonsdale, principally in 

 having a more compact and less robust form of growth ; the corallites are 

 straighter, closer together and of smaller diameter. 

 U R— 4 



