XX1V BRITISH FOSSIL CORALS. 
1. Genus CYLICOSMILIA. 
Milne Edw. and J. Haime, Ann. des Sc. Nat., 3™° serie, t. x, p. 232, 1848. 
Corallum simple, adherent. Colwmel/a well developed, and of a spongy structure. 
Septa thin, slightly exsert, covered laterally with small granulations, and closely set. 
Dissepiments very abundant. Wad/ thin, with a rudimentary epitheca. Coste simple, not 
ramified, and distinct down to the basis of the corallum. 
Typ. sp., Cylicosmilia altavillinsis, Milne Edw. and J. Haime, loc. cit., p. 233 ; Caryophyllia altavillinsis, 
Defrance; Michelin, Icon. Zooph., tab. Ixxiv, fig. 2. 
2. Genus PLACOSMILIA. 
Milne Edw. and J. Haime, loc. cit., p. 233, 1848. 
Corallum simple, compressed, free, and subpediculate. Calice more or less elliptical. 
Columella \amellar. Septa numerous, closely set, slightly exsert, and not much granulated ; 
systems apparently very numerous. Dessepiments abundant. Wall naked, or with a rudi- 
mentary epitheca. Cosfe simple, not ramified, and distinct from the basis of the corallum. 
Typ. sp., Placosmilia cymbula, Milne Edw. and J. Haime, loc. cit., p. 234; Turbinolia eymbula, Michelin, 
Icon., pl. lxvii, fig. 1. 
os Genus TROCHOSMILIA. 
Milne Edw. and J. Haime, loc. cit., p. 236, 1848. 
Corallum simple, subpedicellate or adherent. Ca/ice nearly horizontal. No columella. 
Septa meeting in the centre of the visceral chamber, numerous, and closely set; systems 
apparently very numerous. Dissepiments abundant. Wall naked, or with a rudimentary 
epitheca. Coste simple, granulated, delicate, usually distinct from the basis, and never 
ramified. 
Typ. sp., Trochosmilia Faujasii, Milne Edw. and J. Haime, loc. cit., tab. v, fig. 6. 
4. Genus PARASMILIA. 
Milne Edw. and J. Haime, loc. cit., p. 243, 1848. 
Corallum simple, adherent or pedicellate, tall, subturbinate, and presenting in general 
indications of an intermittent growth. Cadice nearly circular; fossula not very deep. Columella 
spongy. Septa exsert, very granular laterally, and arched at their apex. Déssepiments not 
abundant, and existing only in the inferior part of the loculi. Wail naked, or with a rudi- 
mentary epitheca. Coste straight, simple, not ramified, somewhat granulated, and im 
general projecting more near the calice than in the lower part of the coral. 
Typ. sp., Parasmilia centralis, Milne Edw. and J. Haime, loc. cit.; Madrepora centralis, Mantell, 
Geol. of Sussex, tab. xvi, figs. 2, 4. 
