128 TABULATE CORALS. 



so uncertain and so difficult of recognition. This opinion is 

 strongly supported by the appearances presented by tangential 

 sections (PI. VI., fig. 2 a). In these, the characteristic com- 

 pressed form and the moderately thick walls of the corallites 

 can be admirably observed ; but the single septal ridge above 

 alluded to can only be made out occasionally, and never, so far 

 as I have seen, in more than quite a small proportion of the 

 tubes. It does not seem, therefore, to be of constant occur- 

 rence, and no other traces of septa can be detected. 



In longitudinal sections (PI. VI., fig. 2 b) the chief feature 

 observable is the abundance of the horizontal and complete 

 tabulae, no traces of septa being recognisable. 



Formation and Locality. Abundant in the Devonian Lime- 

 stone of Gerolstein and Bensburg in the Eifel. I do not yet 

 feel certain if any of the specimens which I possess from the 

 Devonian limestones of Devonshire are really identical with 

 this species, though some certainly present a close resemblance 

 to it. None of the species of Alveolites from the Devonian of 

 North America that I have examined, or that have been figured 

 or described by other observers, seem to be referable to this 

 species. 



Alveolites Labechei, Edwards and Haime. 

 (PL VI., figs. 3 and 3 a.) 



Favosites spongites (pars), Lonsdale, in Murchison, Silurian Syst, PL XV., 



figs. 8-8 b (caet. exclusis), 1839. 

 Alveolites Labechei, Milne-Edwards and Haime, Pol. Foss. des Terr. Pal., p. 



257. rtS 1 - 



Labechei) Milne-Edwards and Haime, Brit. Foss. Cor., p. 262, PL 



LXL, figs. 6-6 b, 1854. 

 Grayi, Milne-Edwards and Haime, Pol. Foss. des Terr. Pal., p. 



258, 1851, and Brit. Foss. Cor., p. 262, PL LXT.,figs. 2-2 a. 



Spec. Char. Corallum massive, attached to foreign bodies 

 by one point of its base, and forming a flattened expansion 

 with a slightly convex or irregularly elevated surface, the upper 

 surface being occupied by calices, while the lower surface may 

 be in large part similarly occupied, or may be covered with a 



