188 



PEOr. p. MAETIN DUNCAN S EEVISION OF THE 



similar points or granulations scattered between the cells (coral- 

 lites), wMcli are not distinctly circumscribed, but often separated 

 for some distance by a porous coenencbyma. 



Synarcea includes Porites conformis, P. monticulosa of Dana ; 

 also Porites antigua, Dana, = P. Dance^ Ed. & H. 



Distribution. — Pecent. Pacific. 



G-enus Napopoea, Quelch, Ann. Sf Mag. Nat. Hist. 188J<, 

 xiii. p. 296. 



Corallum compound, porous. Gemmation intra calicinal, the 

 developing buds with distinct centres almost destitute of distinct 

 walls, at first united in groups of 2-6, and surrounded by the 

 common wall of the parent calicle ; but as development proceeds 

 they are separated off" by a narrow, raised, distinct wall. Cali- 

 cinal depressions very variable in size and shape, according to 

 the number, position, and degree of development of the buds. 

 "Walls of the older calicles porous, distinctly raised, and angular. 

 Septa generally of two cycles, rudimentary. Pali six, sometimes 

 one smaller than the others or absent, generally well developed, 

 and distinctly marking the position of the calicinal centres. 

 Columella rudimentary, represented by small papilliform projec- 

 tions, often absent. 



Distribution. — Becent. Tahiti. 



Genus DiCTYAEiEA, Peuss, Foss. Korallen aus der Insel Java, 

 Novara Exped., Geolog. TJieil, p. 175, pi. ii. fig. 6. 

 The colony is in knotty branchlets. The calices are rather irre- 

 gular in shape, generally pentagonal, separated by a slight ridge. 

 Septa few, about 6 to 12, uniting around the axis by false pali- 

 form lobes. Columella absent. Considerable distinction between 

 the size of the calices and the dimension of the septa. 

 Distribution. — Fossil. Eocene : Java, Asia, Europe. 



Genus EnoDAEiEA, Milne- Edwards Sf Jules Haime, Cornet. Bend. 

 t. xxix. p. 259 (1849). 

 The colony is massive ; the calices are deep and pentagonal ; 

 the trabeculse of the walls of the corallites are well developed, but 

 they retain their spongy appearance. Septa trabecular, not much 

 developed, and in three cycles. Columella absent or rudimentary, 

 Pali six in number and very large, placed before the secondary 

 septa. 



