LAHiE.J CANADIAN PALEOZOIC CORALS. 3 



the calyces. The tabulae are frequently crenulated, or have more or less 

 well defined depressions at the margin. 



As has been already pointed out by Rominger,* all Cambro-Silurian 

 or Silurian species of this genus have spiniform septa whilst those of the 

 Devonian have squamulae. 



Favosites Gothlandica, Lamarck. 



Plate I., fig. 1. 



Favosites Gothlandica, Lamarck. 1816. Hist, des An. sans Vert., vol. II., p. 206. 



Goldfuss. 1829. Petrefacta Germaniae, pi. XXVI., figs. 3a, 3e. 

 Favosites favosa, Goldfuss. 1829. Ibid, pi. XXVI, figs., 2a— c. 



Favosites Gothlandica, Lonsdale. 1839. Murch. Sil. Sys., p. 682, pi. 15>bis, figs. 3, 3a 

 and 4. 

 " " Milne-Edwards and Haime. 1851. Polyp. Foss. des Terr. Paleeoz., 



p. 232 ; and 1855, Brit. Poss. Corals, p. 256, pi. LX., figs. 1, la. 

 " " McCoy. 1855. Brit. Palseoz. Fosa., p. 20. 



" " Billings. 1863. Geology of Canada, p. 305, fig. 302; and 1866, 



Cat. Sil. Fobs, of Anticosti, p. 32. 

 " " Nicholson. 1875. Palseon. of Ont., p. 51. 



Favosites favosa, Nicholson. 1875. Ibid, p. 52. 



Favosites Gothlandica, Nicholson. 1875. Palseon. of Ohio, vol. II., p. 224. 

 Favosites favosa, Nicholson. 1875. Ibid, p. 229. 



Favosites favosus, Eominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 20, pi. IV., figs. 

 1^ and pi. v., fig. 2. 



Corallum growing in subhemispherioal; discoid or irregularly shaped 

 massive expansions generally with a more or less convex upper surface ; 

 basal portion covered by a concentrically wrinkled and finely striated 

 epitheca. Corallites prismatic, generally rather equal in the same speci- 

 men, varying in different individuals from about 2 or even less to 5 

 mm. wide. Pores circular, surrounded by a slightly raised rim, in one, 

 two or three rows in the sides of the corallites ; averaging from about 

 •25 to '33 mm. in diameter. Tabulae complete, flat, at times concave or 

 convex, and varying considerably, even in the same specimen, in their 

 distances apart from each other j they frequently exhibit concentric lines 

 of growth. Marginal depressions or crenulations are often developed in 

 the tabulae and in some specimens are very noticeable, extending for some 

 distance toward the centre of the tabulae ; in the same specimen these 

 crenulations may be well marked in some of the tabulae and altogether 

 wanting or but slightly formed in others. Short, close set, sharply 

 pointed septal spines project inward, with frequently a slight upward 

 inclination, from the walls of the corallites ; sometimes they are arranged 

 apparently without order, at other times in more or less definite 

 longitudinal rows. 



* Geological Survey of Michigan, Fossil Corals, p. 19. 1876. 



