Plocoid. Small, encrusting or subhemispherical. Mar- 

 gins of calicinal walls projecting beyond perithecal sur- 

 face. Circular or oval calices, never much elongated, 

 similar to 7. fragum. 7our complete cycles of septa, 



22. 7avia leptophylla (Verrill) . 

 Also Orbicella aperta Verrill. . 

 Verrill (1868), page 353. 



Distinguished from 7. fragum and 7. gravida by 

 more massive growth up to 2 feet. Cups about 6 mm. 

 Walls of cups thin, separated by blistered coral. Septa 

 project well over top of wall. Confined to Brazil. 



Massive, up to 2 feet. Plocoid. Jrue walls thin with 

 loose vesicular exotheca between calices. Calices 6 mm. 

 Septa rather few, thin, prominent and exsert. Inter- 

 septal loculi wide and deep. 



23. Diploria clivosa (Ellis and Solander), (Plates 14, 

 15). 



Also Meandra clivosa, (Vaughan 1919, Verrill 

 1902) , also TAeandrina clivosa, (Matthai, 1928) . 



Described by Matthai (1928), pages 71-76. 



Greenish brown in grooves, chocolate colored over 

 walls, tentacles bright green, white towards tips. Rather 

 large, heavy, but low growth with irregular knobs over 

 surface. Valleys not all connected together, shallow 

 and narrow, very winding except at edge. Walls never 

 grooved. Septa thin and close together. Florida and 

 West Indies but not Bermuda or Brazil. 



Corallum heavy, spreading. Calicinal surface uneven 

 with short irregular hillocks. Valleys discontinuous, 

 width up to 6 mm, average 3.75 mm, depth 3.5 to 4 

 mm, usually very sinuous but straight towards edge of 

 corallum, Coiline rather sharp ai summit, i to i.5 mm 

 thick, never grooved. Septa thin, 30 to 40, average 



83 



