CORALS FEOM THE NIAGARA. FORMATION. 229 



CORALS FROM THE NIAGARA FORMATION. 



Genus FAVOSITES, Lamarck, 1816. 



(Hist, des An. sans Vert., Vol. II., p. 204.) 



Favosites favosa, Goldfuss. 



Calamopora favosa, Goldfuss; Petref. Germ., pi. 24, figs. 2a, 2c. 



Favosites favosa {f), Hall; Pal. N. Y., Vol. II., pi. 34 A, figs. 5a, 5e. 



Favosites favosa, Nicholson and Hinde; Can. Journ., 2d ser., Vol. XIV., No. 2, 1874. 



Corallum massive, spheroidal, pyriform, or hemispheric, composed of 

 prismatic corallites, the diameter of which, in normal specimens, varies 

 from one to two lines in diameter. The tabulae are about six in the space 

 of two lines, usually more or less conspicuously curved, with their con- 

 vexities directed upwards. Mural pores in two alternating rows upon 

 the flat faces of the corallites. Septa absent, or represented by spini- 

 form projections. 



The corallum in F. favosa, Goldfuss, is essentially similar to F. Goth- 

 landica, Lam., and is to be distinguished solely by the slightly larger 

 size of the corallites in ordinary examples, and by the curvature of the 

 tabulae. I have seen unmistakable specimens of this form from the 

 Niagara limestone of Owen Sound, in Canada, and am inclined to refer 

 here a small mass from the same horizon in Ohio. In this example the 

 corallites vary from a line and a half to two lines in diameter, with a 

 few smaller ones intercalated amongst themji and their shape is usually 

 pentagonal. The tabulae, however, are straight and not curved. This 

 latter fact renders the reference to F. favosa somewhat doubtful, and the 

 same may be said of the specimens described by Hall from the Niagara 

 limestone of Milwaukee (loc. cit., p. 126). 



Position and locality : Niagara formation, Dayton, Ohio. 



