INTRODUCTION. xxv 



5. Genus Ccelosmilia. 

 Differs from Parasmilia by not having any rudiments of a columella. 



Typ. sp., Calosmilia poculum ; Parasmilia poculum, Milne Edw. and J. Haime, loc. cit., tab. v, fig. 5. 



6. Genus Lophosmilia. 



Milne Edw. and J. Haime, loc. cit., p. 246, 1848. 



Corallum simple, subturbinate, adherent. Calice almost circular. Columella lamellar, 

 small. Sepia very exsert, unequal ; their apical margin highly arched, and their sides 

 granular; the six systems equally developed. Wall naked. Costa simple, and but 

 shghtly marked ; growth not intermittent. 



Typ. sp., Lophosmilia rotuadifolia, Milne Edw. and J. Haime, loc. cit., tab. v, fig. 3. 



7. Genus Diploctenium. 



Goldfuss, Petref. Germ., p. 50, 1826-30. 



Corallum simple, extremely compressed, flabelliform, free, but retaining a thick 

 peduncle. Calice representing a very long ellipse, arched so strongly that the extremities 

 of its long axis descend much below the level of its small axis ; fossula very narrow, very 

 long, and shallow. No columella. Septa extremely numerous, nearly equal, thin, very closely 

 set, and slightly exsert. Dissepiments simple and numerous. Walls naked. Costa 

 extremely numerous, narrow, crowded, nearly equal, distinct from the basis, and dichoto- 

 mosing, or even dividing into three branches as they rise. 



Typ. sp., Diploctenium lunatum, Michelin, Icon. Zoopb., tab. lxv, fig. 8 ; Madrepora lunata, Bruguiere, 

 Journ. d'Hist. Nat., vol. i, tab. xxiv, figs. 5, 6. 



8. Genus Montlivaltia. 



Lamouroux, Exposit. Metbod. des Genres de Polypiers, p. 78; Milne Edw. and J. Haime, loc. cit., p. 250. 



Corallum simple, adherent, or sub-pedicellate. No columella. Septa exsert, in general 

 numerous and crowded, very broad, and forming apparently twelve or more cycla. Wall 

 covered by a highly-developed membraniform epitheca ; growth not intermittent. 



Typ. sp., Montlivaltia caryophyllata, Lamouroux, op. cit., tab. lxxix, figs. 8, 9, 10; Micbebn, op. cit., 

 tab. liv, fig. 2. 



9. Genus Peplosmilia. 



Corallum resembling Montlivaltia, but having a large, lameUiform columella. 



Typ. sp., Peplosmilia Austenii, nob. 



