62 TABULATE CORALS. 



doubt. There is also the same general disposition of the cal- 

 ices, there beine a marked difference in size between different 

 corallites. In this respect, however, the condition of matters 

 resembles that which obtains in large-sized colonies of the 

 normal F. Forbesi from the Upper Silurian. That is to say, 

 there is an approach to a general equality in size of the tubes, 

 the larger ones not being exceptionally large (mostly from 

 three-quarters of a line to a line in diameter), and being very 

 numerous as compared with the small tubes (PI. III., fig. i a). 

 The distinguishing peculiarity of this form, however, is the 

 quite unusual development of the septa, which are conspicuously 

 visible even to the unassisted eye, and extend a considerable 

 distance into the cavity of the tubes (PI. II., fig. 3). In long 

 sections (PI. III., fig. i b), the septa are seen to have the form 

 of strong spines, with a broad base, and with a distinct upward 

 inclination. The tabulae resemble those of the normal form of 

 F. Forbesi. The mural pores, as revealed by thin vertical 

 sections, appear to be numerous and close-set, being apparently 

 in two or even in three rows ; but I do not think that much 

 stress can be laid upon this character, especially when only 

 known by the, in this respect, partial and imperfect evidence 

 afforded by transparent longitudinal slices. - 



Favosites Forbesi, E. and H., var. Tuberosa, Rom. 

 (PL III., figs. 2-2 ^.) 



Favosites basaltka (pars), Goldfuss, Petref. Germ., PI. XXVI., fig. 4 a (ctet. 



exclusis), 1829. 

 „ basaltka (pars), Billings, Canad. Journ., new sen, vol. iv. p. 106, 



1859. 

 „ Forbesi, Nicholson, Report on the Paljeontology of Ontario, p. 48, 



PL VII., fig. 8, and PL VIII., fig. 4, 1874. 

 ,, tuberosus, Rominger, Fossil Corals of Michigan, p. 30, PI. IX., figs. 



I and 2, 1876. 



Corallum forming cylindrical or club-shaped, rarely hemi- 

 spherical masses, varying from an inch up to half a foot or 

 more in length, according to their age. Corallites conspicu- 

 ously unequal in size, the larger ones being somewhat cylin- 



