JsophylUa muUiflora Verrill 

 LESSER CACTUS CORAL 



25. Valleys usually about 12 mm wide. No lamellae in valley 



floor. Base of walls 3 mm wide, or less (Plate 21) 26. 



Coral lighter and more porous. Valleys usually over 18 mm 

 wide. Lamellae sometimes arranged lengthwise on valley 

 floor. Wall slopes towards middle of valley. Base of wall about 



1 2 mm wide. Top of wall has regular shallow groove between 

 small but distinct ridges (Plate 18) 27. 



26. Coral may narrow towards end and may have stalk beneath. 

 Walls over 2.5 mm thick. Septa about 18 per cm and 

 perforated. (Plates 19, 20, 21) 



TWanicina areolata (Linnaeus) 



ROSE CORAL 

 Coral never narrow at ends and never has stalk. Wall less 

 than 2.5 mm thick. Valley deeper and narrower. Septa only 

 12 per cm and not perforated. 



"Manicina mayori Wells 



TORTUGAS ROSE CORAL 



27. Coral usually less than 6 inches across and stalk underneath. 

 Valley usually over 12 mm deep. Wall about 10 mm wide at 

 base. Septa 11 per cm. 



ColpophyUia amaranthus (Muller) 

 Coral may be small or very large. Valley usually under 1 2 mm 

 deep. Wall about 15 mm wide at base. Septa 9 per cm 

 (Plate 18) ColpophyUia natans (Muller) 



BRAIN CORAL (Young form) 



28. Coral grows out into straight or irregularly knobbed pillars. 

 Valleys shallow and narrow. Walls flattened. Septa lack teeth 

 (Plate 32) T^endrociyra cyUndrus Ehrenberg 



PILLAR CORAL 

 Coral forms dome shaped or flat lobed masses 29. 



29. Septa lack teeth on their edges (Plate 29) 



Tdeandrina meandrltes (Linn) 

 BRAIN CORAL 

 Septa have toothed edges (Plates 15, 16, 17, 18) 30. 



30. Valleys about 18 mm wide and 12 mm deep. Walls grooved 

 on top between small but distinct ridges. Septa 9 per cm 

 (Plate 18) ColpophyUia natans (Muller) 



BRAIN CORAL 



69 



