NOTES ON THE FOSSILS OF ONTARIO. 147 



average diameter in F. Gothlandica being about one line. The mural 

 pores are of large size, in two or three rows, the third row sometimes 

 occupying the prismatic angles of the corallites. The tabulfe are 

 for the most part horizontal, not curved, about seven in the space of 

 two lines. It is uncei'tain whether this form is new or not, and in 

 the latter case whether it is to be regarded as an extremely hwge 

 vaiiety of F. Gothlandica or F. favosa, Goldf. 



Locality and Formation. — Niagara Limestone, Eockwood, Thorold, 

 Owen Sound. 



42. Favosites favosa, Goldfuss. (/?e/! Calamopora favosa, Gold- 

 fuss, Petref. Germ. pi. xxvi. figs. 2a-G.) The corallum in this species 

 is massive and in all esseiitial respects quite like F. GotJdandica, 

 except for the fact that the tabulae are strongly and uniformly curved, 

 with their convexities directed upwards. The corallites are prismatic, 

 from one line to one and a half lines in diameter ; the tabula? are 

 about six in the space of two line.s ; the muivil pores are in two 

 alternating rows upon the faces of the corallites ; and the septa are 

 represented by spiniform projections. The veiy large examples 

 abi. ve referred to may possibly be a variet;f of this species, though 

 wanting the distinguishing feature that the tabulte are curved. 



Locality and Formation. — Niagara Limestone, Owen Sound. 



43. Favosites venusta, Hall. {lief. Astrocerium vemcstuni. Hall, 

 Pal. N.Y., Vol. II., pi. xxxiv., figs, la-i.) The genus Astrocerium, 

 Hall, cannot be retained, as its distinguishing character, viz., the 

 possession of spiniform septa, is shared by Favosites ; but the present 

 species appears nevertheless to be a valid one. It forms large hemi- 

 spheric or spherical masses, which are usually composed of a succes- 

 sion of concentric layers. The corallites are slender and variable in 

 size, prismatic or polygonal, rapidly increasing in number by fission. 

 The larger corallites are usually about half a line across ; but they 

 have many smaller ones intercalated amongst them, the diameter of 

 which varies from the fiftieth of an inch to half a line. The calices 

 are hexagonal, polygonal, or sub-cylindrical, and our specimens show 

 only rudimentary septa, in form of very short spiniform projections. 

 The tabuhie are complete, straight or flexuous, four or six in the 

 space of one line. The mural pores are not determinable. 



There can be little doubt as to the distinctness of this species from 

 F. Gothlandica, the much smaller size of the corallites alone consti- 

 tuting a good ground of separation. It most resembles the F. hemi- 



