are about 5 mm in diameter with strong parallel ridges 



Agaricia nohilis Verrill 

 HAT CORAL 



18. Surface of coral grooved by elongated and more or less 

 branching valleys (Plates 14, 15, 16, 17, 18, 19, 20, 29, 



30, 32, 37, 38) 19. 



Surface consists of circular, polygonal, oval or elongated cups. 

 Valleys, if present, never very long, but narrov/ and un- 

 branched (Plates 6, 11, 12, 23, 25, 27, 31, 36) 33. 



19. Coral somevv^hat flattened or top-shaped, sometimes w^ith short 

 stalk below. Rarely grows over 6 inches (Plate 19, 30, 37) — . 20. 

 Coral larger except in early growth. Forms large dome 

 shaped, irregularly lobed or flat masses, sometimes with thick 

 pillars (Plates 14, 15, 16, 18, 29, 32) 28. 



20. Edges of septa appear smooth to naked eye (Plates 29, 30) .— 21. 

 Edges of septa visibly toothed 22. 



21. Coral rarely more than 6 inches long. Usually has main 

 lengthwise valley from which smaller valleys branch out. 

 Width of valley over 1 2 mm (Plate 30) 



jWeandrina hrasiViensis Edwards 



and Haime 



BRAZILIAN ROSE CORAL 

 Coral grows larger. No main valley but valleys usually 

 radiate from center. Width of valley under 1 2 mm (Plate 29) 



!Meandrina meandrites (Linnaeus) 



BRAIN CORAL (Young Form) 



22. Edges of septa have coarse teeth turned obliquely upwards 



(Plates 37, 39, 40) - 23. 



Edges of septa have fine teeth not turned upwards (Plates 



18, 19, 20, 21) 25. 



23. Valleys less than 1.5 cm wide and relatively long. Thin 

 toothed vertical plates or lamellae running lengthwise on the 

 valley floors (Plates 37, 38) 



yMycetophyUia tamarckana 

 (Edwards and Haime) 

 Valleys 1.5 to 3.5 cm wide and relatively short. No lamellae 

 (Plates 39, 40) 24. 



24. Valleys average 2.5 cm wide. Septa about 8 per cm (Plate 39) 



IsophyUia sinuosa (Ellis and 

 Solander) 



CACTUS CORAL 

 Valleys average 1.5 cm wide. Septa about 12 per cm 



6S 



