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. id). 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 (PL 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. 



(PI. VI., figs. 3 and 3 n) 



Favosites spongiies (pars), Lonsdale, in Murchison, Silurian Syst., PI. XV., 



figs. 8-8 ^ (cffit. exclusis), 1839. 

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



257, 1851. 



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



LXL, figs. 6-6 ^, 1854. 

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



258, 185 1, and Brit. Foss. Cor., p. 262, PI. LXI., figs. 2-20. 



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 



