INTRODUCTION. XXV 
5. Genus C@LOSMILIA. 
Differs from Parasmilia by not having any rudiments of a columella. 
Typ. sp., Celosmilia 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. Ca/ice almost circular. Colwmella lamellar, 
small. Septa very exsert, unequal; their apical margin highly arched, and their sides 
granular; the six systems equally developed. Wall naked. Coste simple, and but 
slightly marked ; growth not intermittent. 
Typ. sp., Lophosmilia rotundifolia, Milne Edw. and J. Haime, loc. cit., tab. v, fig. 3. 
7. Genus D1IPLOCTENIUM. 
Goldfuss, Petref. Germ., p. 50, 1826-30. 
Corallum simple, extremely compressed, flabelliform, free, but retainmg 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. Coste 
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. Zooph., tab. lxv, fig. 8 ; Madrepora lunata, Bruguiere, 
Journ. d’Hist. Nat., vol. i, tab. xxiv, figs. 5, 6. 
8. Genus MONTLIVALTIA. 
Lamouroux, Exposit. Méthod. 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. Wail 
covered by a highly-developed membraniform epitheca ; growth not intermittent. 
Typ. sp., Montlivaltia caryophyllata, Lamourous, op. cit., tab. xxix, figs. 8, 9, 10; Michelin, op. cit., 
tab. liv, fig. 2. 
9. Genus PEPLOSMILIA. 
Corallum resembling Montlivaltia, but having a large, lamelliform columella. 
Typ. sp., Peplosmilia Austenii, nob. 
