8 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



having more numerous diaphragms and in the mural pores being on the 

 lateral faces instead of at the angles of the cells." This last distinction 

 disappears when we consider that F. Niagarensis is described as having 

 pores "distinctly visible in the sides of the cells," and the figures of this 

 species* would lead to the belief that the distances apart of the tabulae 

 are very variable. The only difference then between F. Helderbergice 

 and F. Niagarensis appears to be in the shape of the corallum which in 

 the former species is " large, lenticular, depressed convex or hemi- 

 spherical," and in the latter spherical or clavate, a difference which 

 though slight, may be considered sufficient, if it be constant, for the 

 separation of the two species. 



Favosites Gaspensis. (Sp. nov.) 



Corallum subdendroid or irregularly lobate with polygonal calyces 

 opening on the entire surface ; branches or lobes compressed laterally and 

 varying in their lesser diameter from over 20 to less than 8 mm. The 

 corallites radiate from an imaginary central axis and emerge at right 

 angles to the surface ; they are thin walled, polygonal in section and 

 rather unequal in size but average nearly 3 mm. in width with a few that 

 are somewhat larger. Walls of the corallites pierced by one or two rows 

 of circular pores and carrying on their inner surfaces numerous short 

 septal spines. Tabulae complete, horizontal, about *5 mm. apart. 



This species is of interest on account of the shape of the corallum and 

 of the large size of the corallites ; it bears some resemblance, particularly 

 in the size of the corallites, to the branching coral Favosites cervicornisj 

 (Can. Jour., new series, vol. IV., p. 110, fig. 9) from the Corniferous of 

 Ontario, but differs therefrom in several particulars especially, as all 

 Silurian corals of this genus do from those of the Devonian system, in 

 having septal spines instead of squamulse. 



One specimen from l'Anse au Gascon, Baie des Chaleurs, Que. ; collected 

 by R. Bell in 1862. Lower Helderberg formation. 



Favosites basaltica, Goldfuss. (Sp.) 



Plate I., figs 3, 3a. 



Calamopora basaltica (pars), Goldfuss. 1829. Petrefacta Germanise, vol. I., p. 78, pi. 



XXVI., fig. A a (caet. exclusis). 

 Favosites Gothlandica, Billings. 1859. Canadian Journal, new series, vol. IV., p. 104, 



figs. 2, 3, 4. 

 Favosites basaltica, Billings. 1859. Ibid, p. 106, fig. 8. 



* Op. cit., pi. 34 A bis, figs. 46, 4e, 4/. 

 t Vide, p. 12. 



