35 per cm, in two alternate series. Principal septa with 



rather thick palijorm lobes. All septa continuous over 



colline, exsert ends angular. Columella well developed, 



of closely twisted trabeculae about i to i.2 mm in 



width. 



24. Viploria labyrinthijormis (Linnaeus), (Plate 16). 



Also Meandrina labyrinthijormis, (Matthai, 1928), 

 ^Iso Tiieandra labyrinthijormis (Verrill, 1902). 



Described by Matthai (1928) , pages 63-71. 



Color bright orange yellow to brownish yellow. 

 Forms large rounded boulders. Valleys twisting, nar- 

 rower and deeper than D. sirigosa, nearly all inter- 

 connected. Walls thick, with a longitudinal groove, 

 which is sometimes wider and deeper even than the 

 valleys. Septa thicker and not quite so closely arranged 

 as D. strigosa. Abundant in area behind reef edge, 

 Bermuda, Bahamas, Florida and the West Indies. Not 

 Brazil. 



Tiemispherical, evenly convex, heavy masses up to 

 6 or 8 \eet diameter. Valley very sinuous except at 

 edge oj corallum, almost continuous, width up to 8 mm, 

 average 5 mm, depth 5 mm. Colline thick, vesicular 

 peritheca up to 20 mm, average 8 mm. Ambulacrum 

 invariably grooved up to 22 mm in width, average 5 

 mm and up to i2 mm deep, average 6 mm. Septa i4- 

 ii per cm, nearly all meetimj columella, thicker than 

 D. strigosa. Broad paliform lobes. Close, blunt, septal 

 teeth, uppermost directed oblicjuely upwards. Principal 

 septa exsert i mm, with costae. Columella well de- 

 veloped of thin, closely twisted trabeculae. 

 25. 'Diploria strigosa (Dana), (Plate 17). 



Also Vlatygyra viridis (Lesueur), Vaughan 1901, 

 also TAeandra cerebrum (Ellis and Solander) , Verrill, 



84 



