144 PROI'. p. MARTIN DUNCAlSr's KEVISIOK OF THE 



Grenus Halomitra, Dana, Exj^l. Exped. 1846, Zoophytes, x?- 311 ; 

 P. Martin Duncan, Journ. Linn. Soc, Zool. vol. xiii. p. 155 

 (1883). 



Syn. Podahacia, Ed. & H. 



Corallum compound, free or attached, convex or folded. Upper 

 surface with a circular, funnel-shaped, large calice, surrounded 

 with a ring of smaller calices. Septo-costal rays continuous from 

 central calice to others and to the thin margin. Septa numerous, 

 unequal, denticulate, some trabeculate in parts, solid otherwise. 

 Synapticula long or short, vertical. Costse marked on the per- 

 forate and echinulate base. 



Distrihution. — Mecent. Eed Sea and Indian Ocean, Oceania. 



This genus absorbs Podalacia, Milue-Edwards and J. Haime, 

 and therefore has a wider distribution. 



Grenus Sandalolitha, Quelch, Ann. Sf Mag. Nat. Hist. 1884, 

 xiii. p. 293. 

 Corallum compound, flattened, free, much elongated, and very 

 thin. "Wall sparsely porous, and extremely reduced. Distinct 

 costse, closely granulated or very finely and bluntly echinulate, 

 curving towards the short axis. Calices few, in the long diameter 

 of the corallum ; parent calicle very large, occupying the centre, 

 forming almost the entire corallum, with very numerous septa, 

 there being about seven complete cycles, but a much larger 

 number of cycles incompletely developed on the long axis ; smaller 

 calicles very few, distinctly radiate, developing on the course of 

 and interrupting the larger septa in the long axis of the parent 

 calicle. Septa very long, crowded, curving towards the short 

 axis, and of more or less equal vertical extent, very low, giving an 

 even laminate appearance to the corallum. Synapticula well 

 developed, and forming strong connexions at the basal parts of 

 the septa. Columella rudimentary and trabeculate. 

 Distrihution. — Becent. Tahiti. 



Genus Cetptabacia, Milne-Edwards Sf Jules Haime, Hist. Nat. 

 des Corall. vol. iii. p. 22 (1860). 



Corallum compound, free, oblong, convex above and concave 

 beneath. Calices with radiating septo-costse, some calices occu- 

 pying the central axial line and there are others on either side. 

 Septo-costse short and not numerous. Inferior surface echinu- 

 late and perforate. 



Distribution.- — Becent. Indian Ocean, Manilla, Pacific. 



