■J*""-] CANADIAN PALAEOZOIC CORALS. 91 



of Ohio. Mr. Whiteaves has also recognized it from the Galena-Trenton 

 of Lake Winnipeg. 



Protarea vetusta, var. magna, Whiteaves. 



Protarea vetusta, var. magna, Whiteaves. 1897. Contr. to Can. Palseon, vol. III., pt. 

 3, p. 155, pi 18, figs. 2, 3, 3a. 



From the Galena-Trenton of Lower Fort Garry, Manitoba, R. Bell 

 1880, and T. 0. Weston, 1884. 



Genus STYLAR.a;A, Von Seebach, 1866. 



(Zeitschr. d. deutsch. Geol. Ges., Bd. XVIIL, p. 304.) 



" Corallum composite, the sclerenchyma traversed by numerous fine 

 inosculating canals. Corallites short, opening on the surface by rounded 

 or polygonal calices, of moderate depth. Septa in the form of a variable 

 number of short blunt ridges extending into the interior of the visceral 

 chamber, the axis of which is occupied by a well developed circular or oval 

 columella, which the septa do not nearly reach. Strong and complete 

 tabulae present or absent. Corallum encrusting, or (?) attached only at a 

 single point." (Nicholson.) 



Stylar^a pabva, Billings. (Sp.) 

 Plate 5, figs. 9, 9a and 96. 



Columnaria parva, Billings. 1859. Canadian Naturalist, vol. IV., p. 428. 

 ? Stylarcea occidentalis, Nich. and Eth., jun. 1878. Sil. Toss, of Girvan, p. 62, pi. IV. 

 figs. 2, 2a, 26. 



Corallum thinly incrusting, from 1 to 5 or 6 mm. thick, forming flat 

 expansions, with well marked, sunken, shallow calyces, on the uppei 

 surface ; the single specimen* in the collection is convex above, measures 

 about 6-5 cent, across and has a maximum thickness of 16 mm., attained 

 by the succession of five layers of growth the one over the other. Coral- 

 . lites polygonal or subcircular, with thick walls and an average width of 

 •75 mm., either in contact or up to a distance of half their width apart. 

 The centre of the corallites is occupied by a cylindrical, rod-like, columella 

 which appears at the bottom of the calyces as a prominent rounded 



' * Although there is only one specimen now representing this species in the collection, 



If Mr. Billings evidently had several specimens, as he states that the " species occurs in 

 j large, globular, irregular, pyriform or wide depressed convex masses," and further adds 

 that "some of the flattened masses appear to have been more than one foot wide, and 

 '' often they have a thin stratified structure or are composed of successive layers, the 

 f divisional planes between which divide the corallites at right angles." 



