la*,*.] CANADIAN PALAEOZOIC CORALS. 85 



Hudson River of the Island of Anticosti, and the divisions of the Anticosti 

 group, at numerous localities, T. C. Weston, 1855 and 1865, J. Richard- 

 son, 1856, and J. Macoun, 1883; in the Niagara, at Thorold, Ont., E. 

 Billings, 1857, on the Isle of Mann (Burnt Island), Lake Teiniscaming, 

 Que., A. E. Barlow, 1893, at Cross Lake Rapids, Roche Rouge, and 

 Grand Rapids, Saskatchewan River, Sas., J. B. Tyrrell, 1890, (by whom 

 it was identified with L. papillata) and at Grand Rapids, D. B. Dowling, 

 1891 ; in the Lower Helderberg, at " The Forks " of the Scaumenac River, 

 Que., R. W. Ells, 1883. 



Lyellia Americana, Milne-Edwards and Haime. 



Plate V., figs. 2, 2a. 



Lyellia Americana, Milne-Edwards and Haime. 1851. Polyp. Foss. des Terr. Palaeoz, 



p. 226, pi. 14, figs. 3, 3a. 

 Heliolites speciosus, Billings. 1865. Canadian Naturalist, new series, vol. II., p. 426. 

 Heliolites speciosus,* Billings. 1S66. Cat. Sil. Foss. of Anticosti, p. 30, fig. 13. 

 Lyellia Americana, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 14, pi. II., figs. 

 1 and 2. 



Corallum hemispherical, turbinate or subpyriform, sometimes measuring 

 5 or 6 inches across. Corallites circular, at right angles to the sur- 

 face, where they are slightly exsert, varying in diameter in the same and 

 in different specimens from 2 to 3 mm. ; they are separated from one 

 another by spaces varying from 1 to about 5 mm. in width, but when 

 crowded together in any part of the corallum they become almost con- 

 tiguous. Sep!.a twelve in number, in the form of carinse bearing stout 

 spines extending half way or in some specimens almost to the centre of 

 the corallites ; in many specimens the carinas alone remain projecting 

 slightly inward from the walls of the corallites. Interstitial spaces filled 

 with vesicular structure made up of convex plates resting on each other 

 and inclosing somewhat lenticular shaped cavities varying in width from 

 1 to 5 or 6 mm. Tabulae of the corallites horizontal, often rather irregu- 

 lar, two or three in a space of 1 mm. The edges of the calyces are 

 slightly exsert, crenulated and decorated by a circle of twelve rounded 

 tubercles ; similar well marked tubercles occur on the surface between 

 the calyces. It is only in well preserved specimens and ones in which 

 the surface is not abraded that the tubercles are seen. 



Occurs in the Niagara formation and in division I of the Anticosti 

 group ; in the Niagara, half a mile north-west of Portage Bay, Lake 

 Manitou, Grand Manitoulin Island, Lake Huron, R. Bell, 1865, at Owen 

 Sound, Ont., J. Townsend, 1882, on the Isle of Mann (Burnt Island), 

 Lake Temiscaming, Que., A. E. Barlow, 1893 ; in division I of the Anti- 



* See foot-note page 84. 



