12. Main branches usually under 2 cm in diameter. Cups usually 

 have depressions around their bases and are less than 3 mm 

 in diameter 



OcuUna valenciennesi Edwards 



and Haime 



LESSER IVORY TREE CORAL 

 Main branches 3 to 5 cm in diameter. Cups usually set upon 

 swollen bases and are up to 3.5 mm in diameter 



OcuUna varicosa Lesseur 



LARGER IVORY TREE CORAL 



13. Septa do not have toothed edges and are about 16 to the cm 

 (Plate 41) 



EusmiUa fastigiata (Pallas) 

 FLOWER CORAL 

 Septa have toothed edges and are less than 14 to the cm 

 (Plate 35) 14. 



14. Septa over 12 to the cm and perforated near top. Teeth 

 numerous and irregular. Average cup length 2.5 cm 



!MussismiUa hartn (Verrill) 

 BRAZILIAN FLOWER CORAL 

 Septa 8 to the cm and not perforated. Teeth larger, fewer and 

 more regular. Average cup length 5 cms. Not found in 

 Brazil. (Plates 34, 35) 



!Mussa anguhsa (Pallas) 

 LARGE FLOWER CORAL 



15. Coral forms flattened, projecting, leaflilce or saucerlike plates 

 but sometimes small knobby masses. Surface has cups ar- 

 ranged in parallel lines which are more or less discontinuous 



and separated by ridges (Plate 4) 16. 



Coral never leaflike. Cups are not in parallel lines and may be 

 either circular or elongate to form valleys or grooves 18. 



1 6. Plates leaflike, encrusting, or sometimes uneven masses. Over 

 5 mm thick. Cups on both faces (Plates 4, 5) 



Agaricia agaricites (Linnaeus) 

 LEAF OR PINEAPPLE CORAL 

 Plates always leaflike, not over 5 mm thick. Cups on upper 

 face only 17. 



17. Plates very thin and saucer shaped. Cups face nearly at right 

 angles to surface of coral and are about 3 mm in diameter 



Aaarxcia fracjiUs Dana 

 HAT CORAL 

 Plates thicker, cups set at acute angle to surface of coral and 



67 



