36 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



Cladopora lichenoides, Rominger. 



Cladopora lichenoides, Rominger. 1876. Geol. Surv. Mich., Foss. Corals, p. 46, pi. 

 XVII., figs. 1 and 4. 



Corallum spreading horizontally in rather thin laminar expansions, 

 from 2 or 3 mm. to over 10 mm. in thickness, with an epitheca on the 

 lower side ; frequently the expansions occur one above the other in an 

 approximately parallel sequence, one tier connected with the one imme- 

 diately below it at one or more points, but otherwise distinct and 

 separated by varying distances. Corallites averaging 1 mm. in diameter, 

 at first prostrate and as a rule slightly flattened, then bending upward 

 and becoming more nearly circular in transverse section, and finally 

 emerging at a slightly oblique angle to the surface. Walls of the coral- 

 lites thin below, but gradually thickened as the surface is approached, 

 in some specimens considerably more than in others. Calyces rather 

 variable in shape, irregularly subpolygonal or oval, 1 mm. in average 

 width, three or four occurring in a space of 5 mm. ; they are without 

 a definite lip except when their obliquity to the surface becomes pro- 

 nounced. Tabulae complete, distant. Squamulse, as shown in one speci- 

 men, occurring on the inside of the walls of the corallites. Mural pores 

 of moderate size, not abundant. 



This species in having corallites that are more or less flattened when 

 prostrate near the base of the expansion shows a certain likeness to 

 Alveolites, which, however, disappears when the walls of the corallites 

 become thick ; it is readily distinguished from other species of Cladopora 

 by its general form of growth. 



Found in the Corniferous limestone of Ontario. 



Cladopora Rosmeri, Billings. (Sp.) 



Alveolites Roemeri, Billings. 1860. Canadian Journal, new series, vol. V., p. 255. 



i. ii Nicholson. 1874. Palaeon. of Ont., p. 54. 



Cladopora Roemeri, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 50, pi. XX., 



fig. 3. 

 Alveolites Roemeri, Whiteaves. 1889. Contr. to Can. Palaeon., vol. I., pt. II., p. 121. 

 ii ti (pars) Whiteaves. 1891. Contr. to Can. Palaeon., vol. I., pt. III., p. 



207 (specimen collected by R. G. McConnell). 



This species was defined by Mr. Billings in the following short des- 

 cription — " Stems from two to three lines in diameter, usually cylindrical, 

 but sometimes sub-palmate, branching. Cells transversely oval, about 

 half a line wide and one-fourth of a line in length ; in general distant 

 from each other from half a line to two-thirds of a line in the longitudinal 

 direction of the stem, and half that distance in the transverse direction.' 1 



