160 NOTES ON THE FOSSILS OF ONTARIO. 



Milne ELhvards and Haime identify Cladopora seriata, Hall, witli 

 Alveolites repens, which it much resembles in general form and mode 

 of growth. We have not seen any authentic specimens of the latter, 

 but, judging from their figures and description, its calices are entirely 

 tinlike those of the former in their characters. 



Locality and Formation. — ^Niagara Limestone, Rockwood. 



46. Favosites dubia, De Biainville (V) — -The Niagara Limestone 

 of E-Ockwood yields examples of a form which may, perhaps, be 

 referable to one of the species of Hall's genus Cladopora, but which 

 appears to us to be altogether inseparable from certain slender 

 branching corals which occur abundantly in the Corniferous Lime- 

 stone, and which we have been in the habit of regarding as the 

 young of Favosites dubia, De Blain. In this form the corallum is 

 composed of slender cylindrical stems which have a diameter of frqm 

 three quarters of a line to a line and a quarter, and which divide at 

 short intervals withoiit anastomosis. The corallites have thick walls, 

 and the calices are polygonal, circular, or transversely oval, about 

 three in the space of one line measured diagonally or vertically; In 

 perfect specimens the lower lip of the calice is decidedly prominent, 

 but the calices are nearly of equal size. 



In the larger and more typical specimens of the F. dubia, such as 

 occur in the Devonian Rocks, there are very small corallites inter- 

 spersed amongst the larger ones. This character, however, is not 

 conspicuous in the small specimens from the Corniferous Limestone 

 which appear to be referable to this species, nor can it be detected in 

 the Niagara examples. * It hardly seems, in the absence of any other 

 distinctive character, to be a point of specific value. 



Locality and Formation. — Niagara Limestone, Rockwood. 



Genus CCENITES. (Eichwald.) 

 (=! Limaria, Steiuinger.) 



Generic Characters. — -Corallum encrusting, massive, or sometiniea 

 ramose, extremely like Alveolites, but having the corallites remote, 

 embedded in a coenenchyma, or with walls so thick and fused together 

 as to simulate a coenenchyma. Calices triangular, crescentic, or lunate, 

 visually prominent, and generally furnished with one or more pro- 

 jecting teeth. Tabulfe distinct, mui-al pores large and few. 



The Niagara Limestone of Ontario has yieldel to our researches 

 the following two species of Ccenites. 



