40 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



Genus Striatopora, Hall. 1852. 

 (Palseon. New York, vol. II., p. 156.) 

 Corallum dichotomously branching, made up of subpolygonal corallites 

 that terminate at the surface in expanded, shallow, radially striated and 

 slightly oblique, unequal calyces that join each other in sharply defined 

 polygonal outlines ; walls of the corallites at first thin but gradually 

 thickening toward the surface ; pores irregularly distributed ; tabulse 

 complete, distant. 



Striatopora. flexuosa, Hall. 



Striatopora flexuosa, Hall. 1852. Palaeon. New York, vol. II., p. 156, pi. XL. B, 

 figs, la — e. 

 .. ii Nicholson. 1875. Palaeon. of Ont., p. 55, fig. 26a. 



11 Coral composed of bifurcating or irregularly ramose stems ; branches 

 terete ; cells large, angular below, and opening in a circular striated 

 aperture ; stride extending beyond the cell, particularly in an upward 

 direction ; cells arranged in an irregularly alternating series ; calicles 

 labellate or extended on the lower side, and uniting above in angular 

 ridges separating the cells ; apertures very unequal in size. 



" This species is readily distinguished by the form and arrangement of 

 its cells, which are of much larger proportionate size than any of the 

 ramose corals of the group. The apertures are round, but open into an 

 angular depression, which is limited on the lower side by the calicle, but 

 extends upwards to unequal distances depending upon the arrangement 

 of the cells. The striae which are visible in the circular cell extend 

 beyond into its angular space, and are very distinct in well preserved 

 specimens." (Hall.) 



The specimens on which Professor Hall's description was based were 

 collected in the shale of the Niagara formation at Lockport, N.Y. 



In the museum of the Geological Survey is a specimen of this species, 

 apparently identified by the late Mr. Billings, from the Niagara for- 

 mation, Sydenham Road, county of Grey, Ont. ; collected by R. Bell, in 

 1861. 



The principal point of difference between S. flexuosa and S. Linneana, 

 Billings, is that the calyces of the former are larger and not so crowded 

 together as those of the latter. 



Striatopora Linneana, Billings. 



Striatopora Linneana, Billings. 1860. Canadian Journal, new series, vol. V., p. 253, 



fig. 1. 

 M ii Nicholson. 18 74. Palaeon. of Ont., p. 59. 



Striatopora Linnozana, Rominger. 1876. Geol. Sur., Mich., Foss. Corals, p. 59, 



pi. XXIII., figs. 5, 6. 

 Striatopora Linneana, Nicholson. 1879. Palseoz. Tab. Corals, p. 100, pi. V., figs. 2— 2d. 

 Striatopora Linnozana, Whiteaves. 1889. Contr. to Can. Palaeon., vol. I., pt. II., p. 121. 



