^•J 



CANADIAN PAL^.OZOIC CORALS. 



corallites which, in the former species, are described as being a little over 



1 -5 mm. wide. The difference in the size of the corallites in the two 

 species is so slight that the writer is inclined to regard F. hispida as 

 not specifically distinct from F. Hisingeri, but rather as a form of the 

 latter in which the corallites are a trifle larger than the average. 



Occurs in the Niagara and Guelph formations in Ontario ; on Cockburn 

 and Drummond Islands, Lake Huron and at Thorold (Niagara) ; at Elora 

 and near Durham, lot 16, concession 1, Bentinck township, county of 

 Grey (Guelph). 



Favosites Niagaeensis, Hall. 



(Non P. Niagarensis, Rominger.) 



Favosites Niagarensis, Hall. 1852. Palseon., New York, vol. II., p. 125, pi. 34A bis, 

 figs. 4a — i.J 



A number of specimens of a favosite coral, in the collection of this 

 survey, from rocks of presumably Lower Helderberg age are here referred 

 to this species ; they have been collected, by officers of the survey at 

 various dates since 1858, between Cap des Rosiers and Cape Gaspe, at 

 Cap Bon Ami, Gasp^ on the Matapedia and Restigouche rivers, at 

 one mile east of the Little Cascapedia River and at Cap Bon Ami, N.B., 

 near Dalhousie. These specimens are either spherical or clavate, with 

 gradations between these forms, and seem generally to have had a small 

 basal attachment. The corallites are rather unequal in size and vary in 

 diameter from -5 mm. to slightly over 2 mm. The tabulae are well pre- 

 served, regular and complete, from about five to ten occurring in a 

 space of 5 mm. The sides of the corallites are beset with small spiniform 

 septa and are pierced by one or two rows of pore?. In one specimen 

 from Cap Bon Ami, Gaspe, the coral, beginning with a basal diameter of 



2 cent., increases in thickness slowly for some distance upward, then 

 expanding more rapidly, reaches a diameter of nearly 6 cent, near the 

 top and is rather regularly rounded above ; the total height of the speci- 

 men is 22 cent. 



The Canadian coral agrees with the one described by Hall, in having 

 corallites that are smaller than those of F. Gothlandica, in the position 

 of the pores in the sides of the corallites and in the small basal point of 

 attachment of the corallum. Its general contour is often spherical but 

 frequently becomes higher than broad and sometimes clavate. In the 

 description of F. Niagarensis the corallum is stated to be spherical or 

 irregular in form. 



In describing Favosites Helderhergice*, Hall states that it " differs 

 from Favosites Niagarensis, which it resembles in the size of its cells, in 



* PalEeon. New York, vol. VI., p. 8, 1887. 



