[xxl BRITISH FOSSIL CORALS. 
30. Genus LiTHOSTROTION. 
(Pars) Fleming, British Animals, p. 508, 1828; Strombodes and Lonsdaleia, M‘Coy, in Ann. of Nat. Hist., 
2d series, vol. ili, pp. 10, 11, 1849. 
Corallum resembling Mematophyllum, but having the columella formed by a fasciculus 
of twisted bands, and the sep/a subvesicular exteriorly, and joming the columella along 
their mner edge. 
Typ. sp., Lithostrotion floriforme, Fleming, loc. cit., p. 508. 
31. Genus AXOPHYLLUM. 
Corallum simple, trochoid, and resembling Lithostrotion by its structure. 
Typ. sp., Avophyllum expansum, nob. 
32. Genus SYRINGOPHYLLUM. 
Sarcinula, Dana, Zooph., p. 363, 1846 (not Sareinula, Lamarck). 
Corallum composite, astreiform. Corallites provided with strong wal/s, and much 
developed coste. Septa large. TZubule but little developed. Colwmella styliform. 
Typ. sp., Syringophyllum organum ; Madrepora organum, Linnzus, Syst. Nat., ed. xii, vol. i, p. 1278. 
Family XV. 
CYSTIPHYLLID &. 
Corallum essentially composed of a vesicular tissue, and presenting little or no traces 
of septa or radiate strie. 
1. Genus CYvstTIPHYLLUM. 
Lonsdale, in Murchison’s Silurian Syst., p. 691, 1839. 
Corallum simple, turbinate ; the visceral chamber filled with small vesicular laminz. 
Calice shallow. Walls vesicular. 
Typ. sp., Cystiphyllum Siluriense, Lonsdale, loc. cit., tab xvi bis, fig. 1 (but not fig. 2). 
Sub-order 5. 
ZOANTHARIA CAULICULATA. 
Antipathacea, Dana, Zooph., p. 574. 
Polypi supported on a sc/erodasis or epidermic stem-like corallum. 
