Ixx BRITISH FOSSIL CORALS. 
22. Genus CLISIOPHYLILUM. 
(Pars) Dana, Exploring Exped., Zoophytes, p. 361, 1846. 
Corallum simple, turbinate. Seta well developed, and rising towards the centre of 
the calice so as to form a spurious columella, but not twisted. 
Typ. sp., Clisiophyllum Danianum, nob. 
23. Genus AULOPHYLLUM. 
Corallum simple. Septa well developed. A double mural investment; the interior 
wall dividing the visceral chamber into two portions—one central and columnar, the other 
exterior and annular. No columella. Tabule but little developed. 
Typ. sp., dulophyllum prolapsum ; Clisiophyllum prolapsum, M‘Coy, in Ann. and Mag. of Nat. Hist., 
2d series, vol. lil, p. 3. 
24. Genus ACRRVULARIA. 
Schweigger, Handb. der Naturg., p- 418, 1820. 
Corallum composite, increasing by calicular gemmation. Corallites provided with a 
double mural mvestment; the inner wall disposed as in the preceding genus. Septal 
apparatus well developed between the outer and the inner walls, but much less so in the 
central area. No columella. Tabule not well developed. 
Typ. sp., Acervularia Rameri; Astrea Hennahi, Roemer, Verst. der Hartzgeb., tab. il, fig. 13 (not 
Lonsdale). 
25. Genus STROMBODES. 
(Pars) Schweigger, Handb. der Naturg., p. 418, 1820; Goldfuss, Petref, Germ., vol. i, p. 62, 1826; 
Acervularia, Lonsdale, Sil. Syst., p. 689, 1839; Arachnophyllum, Dana, Zooph., p. 360, 1846 ; Strombodes 
and Actinocyathus, D’Orbigny, Prod. de Paléont. stratigr., vol. i, p. 107, 1849. 
Corallum composite, increasing by calicular gemmation. Corallites constituted prin- 
cipally by a series of superposed, ivaginated, infundibuliform ¢fadu/@, united by ascending 
trabicule, so as to form a columnar mass. Cadices pentagonal, well circumscribed, and 
completely covered with the septal radii. Outer wails not well developed; the inner 
mural investment rudimentary. 
Typ. sp., Strombodes pentagonus, Goldf., Petref. Germ., vol. i, tab. xxi, fig. 3. 
26. Genus PHILLIPSASTREA. 
D’Orbigny, Note sur des Polypiers fossiles, p. 2, 1849. 
Corallum composite, resembling Strombodes, but differing from them by the septal 
