157 



flattened at the summit. The corallites of which they are composed are 

 usually hexagonal but sometimes pentagonal tubes, nearly equal in size, 

 and the largest average from two millimetres and a quarter to two mm. 

 and a half in diameter. The spiniform septa are very short, and the 

 mural pores would seem to be placed in the angles of the corallites, 

 though they cannot be seen distinctly in any of the specimens, as the 

 corallites are nearly always either filled, or their walls lined, with minute 

 crystals of calcite. The tabulse are complete, numerous and placed at a 

 distance of one millimetre apart. A single specimen of a coral which iS' 

 probably only a variety of this species, and in which the corallites 

 average about a millimetre in diameter, was collected at Wicked Point, 

 Lake Winnipeg, by D. B. Bowling, in 1891. 



In the second part of this volume it is stated that " it is doubtful 

 whether F. prolificus should be regarded as a distinct species or as a 

 mere local variety of F. Gothlandica," but if all the specimens from 

 Stony Mountain, East Selkirk, and Lower Fort Garry that are here 

 referred to F. prolificus are correctly determined, it would appear that 

 F. prolificus is most probably synonymous with F. aspera. In Great 

 Britain, according to Edwards and Haime, both F. Gothlandica and F. 

 aspera occur at as low a geological horizon as the Caradoc sandstone. 



Oalapcecia Canadensis, Billings. 



Hemispherical masses of Syringopora. 



D. Dale Owen 1852. Rep. Geoi Surv. Wiscons. , Iowa and 



Minn., p. 181. 



Galap(£cm Canadensis^ 'KW\.\ags 1865. Canad. Nat. and Geol., Sec. Ser., 



vol. II., p. 426. 

 Probably = Calapcecia Suronensis, Billings. 



Cfr. Calapcecia Huronensis, 'RiWings 1865. Canad. Nat. and Geol., Sec. Ser., 



vol. II., p. 426. 

 Columnopora cribriformis, Nicholson. . .1874. Geol. Mag., vol. I., p. 253. 



...187 > Kep. Pal Prov. Ont., p. 25. 

 . . .1875. Rep. Geol. Surv. Ohio, vol. 11., pt. 2, 

 p. 187. 



Houghtonia ffuronica, Rominger 1876. Geol. Surv. Mich. , Foss. Corals, p. 17, 



pi. 3, fig. 3. 



Lower Fort Garry, D. Dale Owen, 1848, Dr. R. Bell, 1880, and T. 0. 

 Weston and A. McCharles, 1884 ; East Selkirk, T. C. Weston and A. 

 McCharles, 1884. At Lake Winnipeg a few imperfect specimens, 

 which appear to be referable to this species, were collected from the basal 

 beds of the limestone at Big Grindstone Point, by Mr. Weston, in 1884, 

 and by Mr. Tyrrell in 1889, at Punk Island by Mr. Weston in 1884, and 

 at Deer Island by Mr. Tyrrell in 1889. Two small but characteristic 

 specimens of this species were collected at the junction of the Little and 



