40 PEOF. P. MARTIN DTJNCAN's EEYISION OP THE 



Genus Efhelia, Milne-Hdwards Sf Jules Kaime, Sist. Nat. 

 des Corall. Tol. ii. p. 124 (1857), amended. 



Colony dendroid; gemmation distichous and at right angles 

 with the margins of the parent calice. Corallites subturbinate. 

 Septa entire where free. Columella rudimentary. Costse sub- 

 equal and project near the calice. Surface granular. Often one 

 bud aborts. 



Distribution. — Fossil. Jurassic : Europe. 



G-enus Acrohelia, Milne-Edwards Sf Jules Saime, Hist. Nat. 

 des Corall. vol. ii. p. 115 (1857). 



Colony dendroid. Calices with extremely exsert septa, entire, 

 lanceolate in shape, and they unite by their inner margins at the 

 bottom of the calicular fossa. Columella and pali absent. Costse 

 in the neighbourhood of the calices only. Gemmation regularly 

 spiral in direction. 



Distribution. — decent. Fiji. 



Genus Asteohelia, Milne-Edwards Sf Jules Saime, Coonptes 

 Rendus de TAcad. des 8ci. t. xxix. p. 68 (1849), amended. 



Colony subdendroid, with more or less coalescing branches 

 or incrusting. Calices unequal, not projecting much, moderately 

 deep. Columella rudimentary, very small, parietal. No pali. 

 Septa dentated. Costse extending down but slightly. Gemma- 

 tion irregular. Ccenenchyma granular, thin. Bases of corallites 

 not increasing much in density during growth. 



Distribution. — Fossil. Miocene : Europe, North America. 



There is no doubt that the genus DendroJielia of Etallon 

 ('Lethsea Bruntrutana,' p. 358, 1860) is unsatisfactory. Milne- 

 Edwards and Jules Haime considered the typical species of 

 Etallon to be a doubtful member of the genus Stylina. The 

 balance of evidence is in favour of the species DendroJielia 

 coalescens, Etall., being one of the Oculinidse. But Etallon is 

 very much in error when he compares the genus with the modern 

 Acrohelia, to which it has only a remote family likeness. 



Etallon considers the genus DendroJielia to include some 

 species of D[elicoenia= Stylina; but it must be remembered that 

 the species of the genera just noticed are represented by much- 

 worn or considerably altered specimens. 



