86 CONTRIBUTIONS TO CANADIAN PAI DEONTOLOGY. 



costi group, Anticosti, at White and Junction cliffs, T. C. Weston, 

 1865. A specimen labelled R. H, 1867, from the Guelph formation 

 at Hespeler, Ont., is here doubtfully referred to this species ; the speci- 

 men is a mould of the upper convex surface of a small corallum and shows 

 the size and distance apart of the calyces. 



One specimen from Lake Temiscaming, depressed turbinate in shape, is 

 6J inches broad and 4 inches high. 



Lyellia exigua, Billings. (Sp.) 

 Plate V., figs. 3, 3a. 



Heliolites exiguusf, Billings. 1865. Canadian Naturalist, new series, vol. II., p. 428. 

 Billings. 1866. Cat. Sil. Foss. of Anticosti, p. 31, tig. 14. 



Corallum subhemispherical, with a moderately convex upper surface 

 and concave below ; a concentrically wrinkled epitheca covers the basal 

 surface. The type specimen, the only one representing the species in the 

 collection, is 45 mm. long, 30 mm. broad and 13 mm. high. Corallites 

 circular, -75 mm. wide, separated from each other by distances generally 

 equal to or less than their width, but varying from 1 to 5 mm. wide. 

 Tabulae of the corallites horizontal, from two to five occurring in a dis- 

 tance of 1 mm. The inner surface of the walls of the corallites is 

 marked by twelve faint septal ridges, but whether these bore spines or 

 not has not been determined. Spaces between the corallites filled with 

 vesicles of rather unequal size, varying from about *16 to over '5 mm. in 

 width. The surface of the corallum between the calyces has a granular 

 appearance caused by the exposure of the vesicles through weathering. 

 The edges of the calyces appear as rings slightly raised above the general 

 level of the surface. 



Gamache Bay, Anticosti, in division I. of the Anticosti group, T. C. 

 Weston. 



Lyellia decipiens, Rominger. 



Lyellia decipiens, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 15, pi. III., 

 %. 1. 



A single specimen from the Niagara formation of Grand Manitoulin 

 Island, Lake Huron, collected by J. Townsend in 1883, is identified with 

 this species ; it is in the form of a small, somewhat discoidal mass, 3 

 inches across and a little over 1 inch high, rather flat above and convex 

 below, where it apparently had an epithecal covering. The calyces are 

 margined by a ring distinctly higher than the surface between the coral- 



f See foot-note p. 84. 



