straight portion and paired lateral branches or sinuous, 

 width up to 2 4 mm, usually i2-i5 mm, depth up to 

 2i mm, usually 8 mm. Colline averages 3.5 mm, thick 

 up to 9 mm, with narrow shallow grooves when thick. 

 Septa thin, i5-20 in one cm, 6-9 meeting columella. 

 Principals have upper two-thirds narrow, and lower 

 part raised into high, broad, convex or rounded pali- 

 form lobes. Perforate. Sides spinulose. Exsert ends 

 meet in notches in middle of colline. Columella up to 

 4 mm thick. Costae narrow and thin about i mm apart 

 at margin of corallum, covered by thin epitheca. 

 29. Manicina mayori Wells. 



Also Manicina gyrosa (Ellis and Solander) , (Mat- 

 thai, 1828, Vaughan 1919, Verrill 1902). 

 Described by Matthai (1928) pages 91-94. 

 Color similar to 7A. areolata. Not narrow at ends 

 and larger than 7A. areolata. No central stalk. Valley 

 not completely interconnected, long and winding, about 

 same size as M. areolata. Wall thinner, septa thicker, 

 about 12 to the cm, and without holes. Found at Dry 

 Tortugas, Florida. 



Massive, not narrow at end<^, heavy, large. J^o cen- 

 tral stalk. ^Discontinuous valley, long and sinuous, 

 sometimes straight, about i2 mm wide up to 20 mm at 

 edge, about io mm deep. Colline about 2 mm. Septa 

 i2 per cm, majority meeting columella. Upper two- 

 thirds narrow, lower part arched to simulate paliform 

 lobes. T^ot perforate. Exsert ends meet in groove of 

 colline. Columella 2.5 to 3 mm thick. Costae about 

 i mm apart and sometimes covered by thin epitheca. 

 30. Cladocora arbuscula Lesueur, (Plate 22) . 



Small densely branching form, each short branch 

 ending in a cup. Cups about 3.5 mm in diameter, 



87 



