356 MANUAL OF NATURAL HISTORY. 



sided, with granulose edges, more or less in- 

 complete ; spinous lamellae, surrounded by 

 pierced or netted parietes ; polyps with a single 

 series of tentacles. 



8. FAMILY. Dendritic-Corals (Dendrophylliidse). 



Polypary hard, porous ; surface minutely 

 longitudinally striated; polyp-cells with a 

 single centre, truncated, concave, generally 

 with a convex centre polyp with numerous 

 tentacles in several series ; gemmiparous. 



9. FAMILY. Eyed-Corals (Oculinidae). Polypary 



hard, covered with enamel ; coral-cells with 

 a single centre, concave, with radii extended 

 over the edges, or with the outer edge radi- 

 ately ground ; polyp with numerous tentacles 

 in two or more series ; gemmiparous. 



10. FAMILY. Starred -Corals (Caryophylliidas). 



Polypary hard, with an enamelled surface ; 

 polyp-cells with many centres, or confluent, 

 deep, round ; laminae torn, serrated, with 

 a twisted centre, often with intermediate 

 smaller plates not reaching the centre ; polyp 

 with numerous tentacles, in two or more 

 series ; gemmiparous. 



11. FAMILY. Brainstone - Corals (Maeandrinidae). 



Polypary hard ; cells confluent, deep, elon- 

 gate, compressed, with a single series of equal 

 laminae forming a single, linear, impressed line 

 in the centre ; polyp with numerous tentacles 

 in two or more series ; growing by sponta- 

 neous division. 



