iambeJ CANADIAN PALEOZOIC CORALS. 49 



along the whole length of the tubes, from ten to fifteen in number in each 

 corallite, not divisible into an alternating series of longer and shorter 

 lamellae. Tabulae numerous, complete, horizontal." (Nicholson.) 



The specimens from the typical locality referred to below and about 

 whose specific identity with Nicholson's coral there can scarcely be any 

 doubt, disagree with the generic characters as quoted above in the size, 

 arrangement and number of the septa. In these specimens the septa are 

 distinctly of two sizes, and are sixteen in number, eight very short septa 

 alternating with eight longer ones. It is probable that in the type speci- 

 mens the septa were not so clearly defined as in those examined by the 

 writer. 



Nyctopora Billingsii, Nicholson. 



Plate II., figs. 1, la. 



Columnaria Goldfussi, Nicholson. 1875. Palaeon. of Ontario, p. 9. But'not C. Gold- 



fussi, Billings. 1857. 

 Nyctopora Billingsii, Nicholson. 1879. Palseoz. Tab. Corals, p. 184, pi. IX., figs. 3, 



3a — c. 



Two specimens from Peterborough, Ont., are identified with this species; 

 one is depressed hemispherical and measures 2J inches across and 1 inch 

 high, the other is somewhat pyriform in shape and is 2J inches high and 

 1 J inch broad. Their structure is as follows : — Corallites polygonal, 

 from 1 to 1 -25 mm. in diameter, in close contact and without apparently 

 a thorough coalescence of the walls, which are generally of moderate 

 thickness. Septa short, lamellar, sixteen in number, eight primary ones 

 alternating with eight secondary ones ; the primary septa, as seen in 

 transverse sections, project about *25 mm. beyond the walls of the coral- 

 lites toward the centre, and are twice the size of the secondary septa. 

 Tabulae flat, from two to seven or eight in a space of 2 mm. 



Trenton formation. — Collected by Mr. Roger, Peterborough, Ont. The 

 writer has not been able to detect the presence of mural pores in the above 

 two specimens from the typical locality. 



SYRINGOPORID^E. 



Genus Syringopora, Goldfuss, 1826. 



(Petrefacta Germanise, t. I., p. 75.) 



Harmodites, Fisher. 1828. Notice sur les Tubipores fossiles, p. 19. 



Corallum fasciculate, more or less compact, or lax and spreading, com- 

 posed of long, cylindrical, generally upright, subparallel, straight or 



