GENERA OF FA VOSITID^. 



67 



(4.) F. Forbesi, var. tuberosa Corniferous Limestone, Port 

 Colborne, and other localities in Ontario ; Hamilton group, 

 Arkona, Ontario. 



Favosites (Emmonsia) hemispherica, Yandell and Shumard. 

 (PL III., figs. 3- 3 A) 



Favosites alveolaris, Hall, Geol. of New York, p. 157, No. 13, figs, i and 



i a, 1843. 

 hemispherica, Yandell and Shumard, Contrib. to the Geology of 



Kentucky, p. 7, 1847. 

 Emmonsia hemispherica, Milne - Edwards and Haime, Pol. Foss. des Terr. 



Pal., p. 247, 1851. 

 Favosites hemispherica, Billings, Canad. Journ., new ser., vol. iv. p. 107, figs. 



5-7, 1859. 

 hemispherica, Nicholson, Rep. on the Palaeontology of Ontario, p. 



49, PL VIII., fig. 3, 1874. 



Emmonsii, Rominger, Foss. Corals of Michigan, p. 26, PI. VII., 

 figs, i and 2. (Non Favosites hemisphericus, Rominger, ibid., 

 p. 24.) 



(It has been pointed out to me by my friend Mr George Jennings Hinde, 

 that Mr S. A. Miller, in his ' Catalogue of the American Palaeozoic Fossils,' p. 

 52, states that this species was described by Troost in the 5th Geol. Rep. of 

 Tennessee, in 1840, under the name of Calamopora hemispherica, I have not 

 included this reference in the above list, as I have not access to Troost's work, 

 and have therefore no means of verifying it. Milne-Edwards and Haime do 

 not include Troost in their list of references. If, however, Mr Miller's reference 

 be correct, then Troost's name should follow the species in place of the names 

 of Yandell and Shumard.) 



Spec. Char. Corallum generally hemispherical or irregularly 

 spherical in shape, massive, often 

 several inches in diameter. Coral- 

 lites prismatic, often with round- 

 ed angles, thick-walled, generally 

 about one line or rather less in 

 diameter, but varying from half a 

 line to a line and a quarter. Calices 

 subpolygonal, irregular in size and 

 form, with thick margins. Septa 

 in the form of longer or shorter 

 spines, but often not recognisable. 

 Tabulse most generally in the form of thin, flexuous, close-set 



Fig. 15. Fragment of Favosites hemi- 

 spherica, of the natural size. Devo- 

 nian (Corniferous Limestone), Ontario, 

 Canada. (After Billings.) 



