3. jMadracis decatis (Lyman), (Plate 1). 



Described by Verrill (1902), page 108. 



Polyp yellow to purple-brcwn in color with white 

 tips to tentacles and lining mouth. Coral forms thin 

 encrustations on rock, sometimes growing out into 

 sparse branches or lobes. Usually under six inches. 

 Cups do not touch, angular or circular with ridged 

 boundary, about 2 mm in diameter. Common in Ber- 

 muda and found throughout the Bahamas and the West 

 Indies. 



Hhinly encrusting, irregularly massive or lobulated or 

 in short stout branches, Plocoid. Ridges hounding 

 calices. T^on-costate. Smooth septa, somewhat reduced, 

 Columella styliform, well developed. Veritheca exten- 

 sive, non-porous. Septa usually io, sometimes 8. 



4. Acrcpora cervicornis (Lamarck), (Plate 2). 

 Also Acropora muricata (Vaughan 1919). Also 



Isopora muricata (Vaughan 1901). 



Discussed by Vaughan (1901), page 312 and 

 (1919), page 482. 



Brownish yellow. Coral forms loosely branched 

 colony with small tubular cup protuding over entire 

 surface. May grow to 10 feet high. Abundant in 

 Florida, the Bahamas and the West Indies, but not in 

 Bermuda or Brazil. 



Ramose colonies, branches consisting of an axial cor- 

 allite with radial corallites budded from it. Corallites 

 protuberant, tubular or nariform, i to 3 mm long, with 

 porous walls. Synapticulothecate. Septa well developed. 

 Vseudo-costate. 



5. Acropora palmata (Lamarck), (Plate 3). 



Also Jsopora muricata forma palmata (Vaughan 

 1900). 



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