GENERA OF FAVOSITID.E. 117 



the point of origin from the parent tube. Ultimately, they be- 

 come more or less completely free — radiating outwards, like the 

 spokes of a wheel — and one or more are continued beyond the 

 general circle of the whorl to give rise to a new umbel. Walls 

 thick, the visceral chambers of the corallites, where the latter 

 are in contact, being placed in connection by distinct mural 

 pores (Rominger). Tabulae remote, complete, so far as ob- 

 served horizontal. Septa represented by from six to ten 

 vertical rows of strong spinules. 



Obs. — I have little to add to the above specific diagnosis, 

 which embodies all the important characters which I can 

 gather from an examination of the specimens in my possession. 

 The existence of mural pores cannot be determined from any 

 of my examples, but Dr Rominger's figures (heliotypes) prove 

 their presence beyond all question. I think it quite likely that 

 Dr Rominger is correct in regarding Aidopora cor nut a, Bill. 

 (Can. Journ., new sen, vol. iv. p. 118, fig. 20), as really founded 

 upon fragments of the present species. I have, however, vari- 

 ous specimens which seem to belong to Atdopora coj^mita as 

 regards their general characters, but which agree with Aulopora 

 proper in being parasitic ; so that I must at present leave the 

 identity of this form with Romingeria umbcllifera an open 

 question. 



Formation and Locality. — Rare in the Corniferous Limestone 

 (Devonian) of Port Colborne, Ontario. 



Genus Alveolites, Lamarck, iSoi. 



(Syst. des Anim. sans Vert., p. 375.) 



Gen. Char. — Corallum massive, incrusting, or ramose, com 

 posed of contiguous compressed corallites, which possess thin 

 walls, and open obliquely upon the surface by subtriangular or 

 semilunar calices. Septa sometimes obsolete, but often, present 

 in the form of longitudinal rows of spinules, which may be 

 equally developed, or may be reduced to a single, double, or 



