364 FUNAFUTI ATOLL. 



and semi-isolated or united in twos or threes, forming short 

 ridges. The apices are all more or less rounded ; they are about 

 2 mm. in diameter, 1 to 3 mm. high, and 2-5 mm. apart at the 

 apex. 



The surface is finely echinulate ; the echinulse are compressed, 

 single or double pointed spinules, about 0-13 mm. high and 0-1 

 mm. apart. 



Obtained on the lagoon reefs. 



MONTIPOBA TUBEROSA, Klunzinger. 



Montipora tuberosa, Klunzinger, Die Korall. Rothen. Meeres, p. 

 32, pi. vi., fig. 6, pi. v., fig. 11, pi. x., tig. 3. 



A very fine specimen is here somewhat doubtfully referred to 

 this species. 



The corallum consists of a foliate expansion, arising from a 

 stout lateral pedicel. 



The frond is concave above, and exhibits a series of wide 

 shallow grooves, which radiate from the centre of the concavity 

 to the margin. On the under surface the grooves are more sharply 

 defined, as are also the ridges occurring between. 



The pedicel is 13 cm. in diameter; the frond is 46 cm. long, 

 40 cm. broad, 2 cm. thick near the pedicel, and from 2 to 3 mm. 

 at the margin. The latter is broken on one side. When com- 

 plete, the outline would be nearly circular and 50 cm. in 

 diameter. 



The upper surface is very uneven ; there are a few large mound- 

 like elevations, a number of small ones, and the whole surface 

 exhibits inequalities due to clusters of from three to six or more 

 corallites which are more or less elevated above the others. 



The corallite apertures are 0*7 mm. in diameter ; they are sur- 

 rounded by thin trabicular walls, tipped with from two to five 

 echinulated spines ; they rarely form a circle round the lip, and 

 are generally wanting on one side. 



The septa are in two cycles, the directives are broad and meet 

 below, the secondaries are narrow and subequal to the rest of the 

 primaries. 



There are a few large corallites scattered on the surface in 

 which an incomplete third cycle of septa is present. 



The under surface of the corallum has a living layer at the 

 margin, varying from 2 to 12 cm. in width. It exhibits a broad 



