52 



the larger ones. The diameter of the larger calices is from half a line to two thirds of a 

 line. The calices are more or less rounded, and their walls thick. The diameter of the 

 branches is mostly from three to four lines. 



In some specimens, in place of there being a few minute corallites interspersed amongst 

 a great number of larger-sized ones, the corallites are only moderately unequal, and the 

 number of small ones is about equal to that of the large ones. 



A considerable number of examples, again, occur, which do not appear to be separable 

 from the preceding, but in which the dimensions are decidedly smaller, the branches being 

 only from one and a half lines to two lines in diameter, and the width of the calices being 

 from one third of a line to half a line. 



Locality and Formation. Abundant in the Corniferous Limestone of Port Colborne and 

 Ridgeway. 



55. FAVOSITES CERVICORNIS (De Blainville). 



Calamopora polymorphic (var. ramoso-divaricata) (Goldfuss), Petref. Germ., PI. XXVII, 

 figs. 3a, 4, 46, 4c (caet exclusis). 



Alveolites cervicornis (De Blainville), Diet., Vol. LX, p. 369. 



Favosites cervicornis (Milne Edwards and Haime), Pol Foss. des Terr. PaMoz., p. 243 ; 

 and Brit Foss. Corals, p. 216, PI. XLVIII, fig, 2. 



Favosites polymorpha (McCoy), Brit Pal. Foss., p. 68. 



Favosites cervicornis (Billings), Canadian Journal, New Series, Vol. IV, p. 110, fig. 9. 



Corallum forming lobate or branched masses, the divisions of which are usually thick, 

 blunt and irregular. The corallites oblique to the axis of the branches, uaequal in point of 

 size, with thin walls. The calices unequally sized, rounded or polygonal, about a line in 

 diameter, sometimes less. 



F. cervicornis differs from F. polymorpha in its more branched and antler-like form, 

 the much greater obliquity of the corallites, and the thinner walls of the calices ; but it is 

 questionable if there exists any difference of specific value. Mr. Billings mentions that he 

 has specimens which agree well with those figured by Goldfuss (Petrefacten, PI. XXVII, figs. 

 3a, 4a, 4&, 4c) ; and I have also several examples which appear to belong to the sfme form. 

 The Favosites cristata of Edwards and Haime appears to be founded upon examples of F. 

 cervicornis, in which the calices are somewhat below the average in width. 



Locality and Formation. Rare in the Corniferous Limestone of Lot 6, Con. 1, Wain- 

 fleet, Ridgeway, and Port Colborne. 



56. FAVOSITES CHAPMAN: (Nicholson). 



(Plate VII, Fig. 6.) 



Corallum branching, apparently not reticulated, the diameter of the branches being from 

 two to four lines. Corallites exceedingly oblique, forming a very acute angle with the axis 

 of the branch, slightly unequal in point of size. Calices rounded or transversely oval, very 

 oblique, but not triangular when perfect. The internal wall of the corallite is prolonged along 

 the next corallite above, whilst the external or lower wall is truncated ; so that whilst the 

 corallite is oblique in its course, the opening of the calice is parallel with the surface. The 

 diameter of the calices varies from half a line to one line. The wall is comparatively thin. 



This species is distinguished from all others known to me by the extremely small angle 

 which the corallites make with the axis of the branch, and by the extraordinary obliquity of 

 the calice. In this last respect F. Chapmani makes a near approach to*the genus Alveolites y 

 but the aperture of the calice is not triangular, unless worn down, the walls of the 

 corallites are quite thin, and there are no traces of septal teeth. The species to which F. 

 Chapmani approaches most closely is F. cervicornis (De Blainville). Our form, however, is 

 ramose and composed of cylindrical branches, instead of being lobate and divided into obtuse 

 finger-like processes ; whilst the aperture of the calice is considerably more oblique. Indeed, 

 F. Chapmani not only resembles Alveolites in the obliquity of the calice, but also in the fact 

 (as regards the more typical members of the latter genus) that the exterior wall of each 



