lvili BRITISH FOSSIL CORALS. 
instead of occupying only the one or two loculi. It is also to be remembered that the 
septal apparatus, although more or less rudimentary, has the same general mode of 
arrangement as in the preceding sub-orders, and never presents the crucial character which 
we shall find in Zoaatharia rugosa. 
This section comprises four families: Favositide, Milleporidee, Seriatoporide, and 
Thecidee. 
Family VIII. 
MILLEPORID i. 
Corallum principally composed of a very abundant ccenenchyma, distinct from the 
walls of the corallites, and of a tubular or cellular structure. Septa not numerous ; 
tabulee numerous, and well formed. 
1. Genus M1iLumpora. 
(Pars) Lamarck, Syst. des An. sans Vert., p. 373, 1801; Palmipora, Blainville, Dict. des Sc. Nat., t. lx, 
p. 356, 1830. 
Corallum of various forms, but more or less foliaceous. Canenchyma extremely 
abundant, of an irregular subtubular structure. Ca/ices of very different dimensions in 
the same corallum. No distinct septa. Zasule horizontal. 
Typ. sp., Millepora alcicornis, Lamarck, loc. cit.; Milne Edw., Atlas du Régne Anim. de Cuvier, 
Zooph., tab. Ixxxix, fig. 1. 
2. Genus Heiopora. 
(Pars) Blainville, Dict. des Sc. Nat., vol. Ix, p. 357, 1830; Dana, Zooph., p. 539, 1846. 
Corallum lobulate, somewhat massive, and differmg from Millepora by the regular 
tubular structure of the coenenchyma, and the existence of small but distinct septa. 
Typ. sp., Heliopora cerulea, Blainville, loc. cit., p. 357. 
3. Genus HELIOLITES. 
Dana, Zooph., p. 541, 1846 ; Paleopora, M’Coy, Ann. and Mag. of Nat. Hist., 2d series, vol. iii, p. 129, 
1849 ; Geoporites, D’Orbigny, Prodr. de Palzeont. stratif. Univers., t. i, p. 49, 1849. 
Corallum sub-globose. Canenchyma regularly tubular. Septal radii advancing 
almost to the centre of the visceral chamber on the upper surface of the tabule, which 
are horizontal. 
Typ. sp., Heliolites pyriformis, Dana, loc. cit., p. 542; Heliolite pyriforme, etc., Guettard, Mem. sur 
les Se. et les Arts, vol. iii, pl. xxii, figs. 13, 14. 
