FAMILIES AND GENEEA OE THE MADEEPOEAEIA. 83 



numerous, exsert, are spined or strongly toothecl, especially near 

 the calicular margin, and the systems are irregularly developed. 

 Cost® spined. Walls striated, and either naked or presenting 

 a rudimentary epitheca. Endotheca well developed. 



Distribution. — Recent. West Indies, East Indies, Hed Sea, 

 Pacific, China. 



The young individuals cannot be distinguished from simple 

 Astrseidse of the Antillia type. It is a large genus, and may be 

 divided into those with the corallites free and with calices circum- 

 . scribed — 3£usscb cymosce- ; and those in which serial growth pre- 

 ponderates — Mussce gyroscB. 



The principal distinction of Mussa from the genus Sympliyllia 

 consists in the perfect union of the walls in this last-named genus. 



5. Subfamily Astrceidcs conjluentes. 



Astrseidse with entire or dentate, ragged, and spined septa, 

 increasing by fissiparity and having excess of serial growth. 

 G-emmation may occur. Corallites united by their walls, costae, 

 or by intermediate tissue, or free. 



Alliances. 



I. EUPHYLLIOIDA. 

 II. EUGYROIDA. 



III. Symphyllioida. 



IV. MONTICULOIUA. 



Eorty genera have been recorded, and revision leaves thirty- 

 three. One old genus becomes a subgenus, and six lapse. 



I. Alliance EUPHYLLIOIDA. 



Colony CECspitose, foliaceous, or flabelliform. Septa dentate or entire. 

 Calices in long series, sinuous or not ; not united by their walls or costse, 

 but free. 



Genus Euphyllia, Ed. & H. 



Genus Glyphophyllia, E. de From. 



Genus Rhipidogyra, Ed. & H. 



Genus Teleiophyllia, Duncan. 



Genus Desmocladia, Reuss. 



Genera absorbed : — 

 Plocophyllia, Reuss; Stenogyra, E. de From,; 

 Fkomentelia, Ferry. 



6* 



