21 Dendroid. Extratentacular budding; Peritheca dense, 



solid. Endotheca subtabular. (Family Oculinidae) 22 



Meandroid. Intratentacular budding. Peritheca dense, if 

 developed. Endotheca vesicular. (Family Trochos- 



miliidae) 23 



22 Columella parietal, feeble. Corallites filling with stereome. 



No pali ..—... 'Madrepora 



Columella of tv^isted trabecular processes, v^ell developed. 

 Pali in irregular crow^n before first one or two cycles. 

 Axial corallite absent OcuUna 



23 Peritheca absent, columella lamellar, if developed. (Sub- 



family Meandrininae) 'Meandrina 



Peritheca dense, columella parietal (Subfamily Dicho- 

 coeniinae) 24 



24 Corallite series mono- to tri-centric and short, united by 



peritheca Vtichocoema 



Corallite series long, united directly by septothecal walls 



"Dendrogyra 



25 Phaceloid colonies 26 



Cerioid or meandroid 27 



26 Septal dentations lacerate and irregular Tdussismilia 



Septal dentations regular ?dussa 



27 Cerioid, mono- to tri-centric. Feeble columella 



lsophy\\as\rea 

 Meandroid 28 



28 Series long, lamellar linkage, Collines discontinuous, 



enclosing several series. No columella 7djce\ophy\\\a 



Series short, trabecular linkage IsophyWia 



29 Septa always laminar and nonporous, margins smooth, no 



snapticuiae (Sub-order CARYOPHYLLIIDA) 30 



Septa secondary thickened singularly porous, margins 

 smooth or beaded. Synapticulae present (Sub-order 

 DENDROPHYLIIDA) (56) 



30 Corallite wall septothecal (Superf amily Caryophyllioidae) 3 1 

 Corallite wall epithecal (Superfamily Flabelloidae) (54) 



31 Wall imperforate (Family Caryophylliidae) 32 



Wall often perforate when first formed (Family Guy- 



niidae) (52) 



32 Endotheca absent (33) 



Endotheca present (44) 



(33) Corallum not entirely covered by the polyp. (Subfamily 



Caryophylliinae) (34) 



i06 



