INTRODUCTION. xxvii 



in the two preceding genera. No columella. Septa closely set, not remarkably thin, slightly 

 exsert, and granulate. Walls covered with a strong epitheca, reaching almost to the margin 

 of the calices. 



Typ. sp., Thecosmilia trichotoma, Milne Edw. and J. Haime, loc. cit. ; Lithodendron trichotomum, 

 Goldfuss, Petref. Germ., tab. xiii, fig. 6. 



15. Genus Barysmilia. 



Milne Edw. and J. Haime, loc. cit., p. 273, 1848. 



Corallum composite, increasing by fissiparity, and forming a very thick stem, on the 

 apex of which the corallites become distinct, and are disposed in transverse series. Columella 

 rudimentary or not existing. Septa closely set. Walls very thick, naked, and covered with 

 delicate costal lines, which are nearly equal and granulate. 



Typ. sp., Barysmilia Cordieri, Milne Edw. and J. Haime, loc. cit., tab. v, fig. 4. 



16. Genus Dendrosmilia. 



Milne Edw. and J. Haime, loc. cit., p. 2/4, 1848. 



Corallum composite, somewhat arborescent, and increasing by lateral gemmation. 

 Corallites with large septa, and a spongious columella. 



Typ. sp., Dendrosmilia Duvaliana, Milne Edw. and J. Haime, loc. cit., p. 274. 



17. Genus Stylosmilia. 

 Milne Edw. and J. Haime, loc. cit., p. 275, 1848. 



Corallum composite, fasciculate, and increasing by lateral gemmation. Corallites tall, 

 with a small number of thick septa, and a styliform columella. Walls thick, with obsolete 

 costce. 



Typ. sp., Stylosmilia Michelinii, Milne Edw. and J. Haime, loc. cit., p. 275, pi. vi, figs. 2, 2". 



18. Genus Placophyllia. 



D'Orbigny MSS. 



Corallum composite, segregate, and increasing by gemmation, which is almost basal. 

 Corallites cylindrical and low. Columella well developed. Septa probably entire. Walls 

 completely covered with a membraniform epitheca, presenting thick transverse folds. 



Typ. sp., Placophyllia dianthus, D'Orbigny MSS. ; Lithodendron dianthus, Goldfuss, Petref. Germ., 

 tab. xiii, fig. 8. 



Section II.— EUSMILIN^E CONFLUENTES. 



Corallum composite, and presenting no separation between the corallites, united in 

 rows, so as to assume a meandriform disposition; multiplication essentially fissiparons. 



