ANTHOZOA. 51 



3. Fossula absent, coral cylindrical, tabulae well developed. 



20. Bloth rophyllum prom issum . 



a. Septa faint or absent, interior cystose X. Cystiphyllum. 



f Coral conical or cylindrical, composed of a series of invaginated cups or 



funnels b. 



b. Septa well developed, interior not cystose cc . 



cc. Cylindrical, of invaginated cups, tabulae well developed, center of 

 calyx smooth. Fossula present or absent. 



VI. Blothrophyllum. 



cc. Cylindrical or top-shaped, consisting of invaginated funnels, 



septa low, reaching center 4. 



4. Septa twisted in center into pseudo-columella. 



IX. Ptychophyllum. 

 4. Septa often weak, not twisted, no pseudo-columella. 



VIII. Chonophyllum . 



b. Septa faint or absent, interior wholly composed of cystose tissue ar- 



ranged in a series of funnel-shaped layers. (Compare Chono- 

 phyllum where septa may be weak.) X. Cystiphyllum. 



f Coral disk-shaped, with flat or slightly convex base covered by a wrinkled 

 epitheca c. 



c. Septa carinated or crenulate, the larger ones reaching the depressed 



center, no fossula XI. Palccocyclus. 



c. Septa smooth, fossula present dd. 



dd. Disk shaped, one fossula XII. Aficrocyclus. 



dd. Cushion or top-shaped, septa uniting into four groups, giving 

 the appearance of two lateral fossulae besides the cardinal one. 



XIII. Hadrophyllum . 



f Coral with one side flat, and the other arched ; operculated and with the 



septa in low ridges XXIX. Calceola. 



* Wrinkled epitheca on lower part only, or rudimentary d. 



d. Structure of coral porous LIX. Balanophyllia. 



d. Structure solid, center with spongy columella... XLIX. Parasmylia. 



* Surface free from epitheca ff. 



ff Structure minutely porous e. 



e. Compressed often with lateral wings LXI. Endopachus. 



e. Conical, pointed at base, free LX. Eupsammia. 



e. Conical with broad base of fixation, septa more or less united near 



center LIX. Balanophyllia. 



ff Structure not porous f. 



f. With basal scar of attachment, conical, septa granular, columella 

 spongy XLIX. Parasmylia. 



f. Without scar of attachment, strong costae, and alternate septa uniting. 



ee. Form conical LVI. Turbinolia. 



ee. Form wedge-shaped LIV. Platytrochus. 



ee. Form disk-shaped LV. Discotrochus. 



B. Corals compound, of loosely branching cylindrical stems each with a terminal 



opening **. 



** Septa fully developed Iff. 



fff Central columella present g. 



g. Epitheca present, columella rudimentary or wanting. 



L I . CI a dophyllia . 



