168 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



differentiated in passing over the mural rings and conspicuously so iii 

 descending into the pit, at the bottom of which the primaries only pass to 

 the centre. Circular pore-openings in the dissepiments at their junction 

 with each other, such as are found in other species of the genus, have 

 been recognized in specimens of this species also. 



Localities and formations. — Corniferous limestone of Ontario. Also at 

 the following localities in Athabasca and Mackenzie districts from the 

 Devonian (Cuboides zone) — Peace River, near Vermilion Falls, Professor 

 J, Macoun, 1875; Peace River, seven miles below the mouth of Red 

 River, Mr. W. Ogilvie, 1875 ; Hay River, forty miles above its mouth, 

 R. G. McConnell, 1887 ; Peace River, Vermilion Falls, R. G. McDonnell, 

 1889. The largest specimen, one from the Vermilion Falls, measures 17 

 cent, across and is between 8 and 9 cent, high at the centre. Meek's 

 type specimen is from the Anderson River, Mackenzie District, lat. 67° 

 N., long. 126° W. (Devonian). Also one specimen from the Devonian of 

 Moose River, Ont., R. Bell, 1895. 



This species seems to pass by insensible gradations into more robust 

 forms that are with difficulty distinguishable from P. Ferneuili, Milne- 

 Edwards and Haime, described originally from the Devonian of Wiscon- 

 sin. It also shows a close affinity to P. Woodmani, White, from the 

 Devonian of Iowa, which is distinguished from it, however, principally by 

 having much more exsert circular rims surrounding the pits, by an eleva- 

 tion of the tabulae, near the centre, over which the primary septa do not 

 pass, and by an absence of carinas on the septa. 



Phillipsastr^a Vkrailli, var. exiguum. (Var. nov.) 

 Plate XIV., fig. 7. 



PhiUipsastrwa Verrillii, Whiteaves. 1891. Contr. to Can. Palaeon., vol. I. pt III 

 p. 205. 



What is considered a variety of the preceding species is represented 

 by a few specimens from the Devonian (Cuboides zone) of Hay River and 

 Vermilion Falls. The coralla reach a fair size and have corallites from 

 about 5 to 7 mm. in breadth, but the central pits average only about 1-5 

 mm. in diameter, and the .septa vary in number from sixteen to twenty. 

 The largest specimen, which is slightly convex above and obtusely pointed 

 below, measures over 1 1 cent, in breadth and is 5 cent. high. 



Localities. — Hay River, forty miles above its mouth, Mackenzie District, 

 R. G. McConnell, 1887, and Vermilion Falls, Peace River, Athabasca 

 District, R. G. McConnell, 1889. 



