xxiv BRITISH FOSSIL CORALS. 



1. Genus Cylicosmilia. 



Milne Edw. and J. Haime, Ann. des Sc. Nat., 3 me serie, t. x, p. 232, 1848. 



Corallum simple, adherent. Columella well developed, and of a spongy structure. 

 Septa thin, slightly exsert, covered laterally with small granulations, and closely set. 

 Dissepiments very abundant. Wall thin, with a rudimentary epitheca. Costa 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. lxxiv, 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 lamellar. Septa numerous, closely set, slightly exsert, and not much granulated ; 

 systems apparently very numerous. Dissepiments abundant. Wall naked, or with a rudi- 

 mentary epitheca. Costa 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 cymbula, Michelin, 

 Icon., pi. Lxvii, fig. 1. 



3. Genus Trochosmilia. 

 Milne Edw. and J. Haime, loc. cit., p. 236, 1848. 



Corallum simple, subpedicellate or adherent. Calice 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. Costa 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. Calice nearly circular; fossula not very deep. Columella 

 spongy. Septa exsert, very granular laterally, and arched at their apex. Dissepiments not 

 abundant, and existing only in the inferior part of the loculi. Wall naked, or with a rudi- 

 mentary epitheca. Costa straight, simple, not ramified, somewhat granulated, and in 

 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. 



