MADREPORARIA. 779 



The species has a much rougher appearance than C. savignyi, from which it differs 

 markedly in its septa. With Solenastraea forskaelana Ed. and H. the specimens agree in 

 all respects except in the different sizes of their septal cycles, but this is a variable character. 



Locality. Hulule, (1) W. reef and (2) passage through same. 



44. Cyphastraea savignyi (Ed. and H.). 



Ed. and H., ii. p. 485. Klz., p. 51, and Gard., p. 761. 



Four specimens, all more or less rounded and completely covered by living polyps, of the 

 identity of which with the above no doubt can be entertained. One specimen, a ball, completely 

 corresponds to Klunzinger's description, differing somewhat from his figure, to which a second 

 rather irregular specimen, evidently grown under bad conditions, completely answers. The 

 other specimens have slightly larger corallites, in exsertness intermediate to my Rotuma 

 specimen, but more crowded together. The costae are always very prominent and not rough. 

 The exotheca has tiny, somewhat scattered spinules, but in the second specimen referi-ed to 

 appears from surface view to be vesicular. Twelve rather smooth septa tjrpically fuse in the 

 columella, and are equal sized. The theca of the calicos is often very delicate, giving their 

 edges a thin appearance. 



Locality. Goidu, all from hollows of the reef-flat and boulder zone. 



45. Cyphastraea hemprichana (Ed. and H.). Ed. and H., Ii. p. 495. 



A single specimen, almost completely surrounded by the corallites, a free edge showing 

 in one place covered by a dense epitheca. Calicos on the upper surface crowded, about 1'5 mm. 

 in diameter, half this breadth distant from one another underneath, edges always distinct, 

 appearing more prominent owing to the slightly exsert upper ends of the septa. Exotheca 

 with a few, almost smooth spinules above, lower and scarcely visible below, not clearly 

 connected with the costae, which are quite distinct at the edges of the corallites. Septa 

 relatively smooth and very little toothed, edges almost perpendicular, 6 clear systems and 

 3 cycles quite distinct from one another, primaries meeting in the centre of the calice so 

 deep down as scarcely to be visible from the surface, shallower calices underneath. 



Locality. Hulule, from the reef-flat of the south end. 



46. Cyphastraea microphthalma (Esper). Ed. and H., Ii. p. 485. 



I refer to this species three specimens, which agree with the descriptions in all essential 

 characteristics. The corallites may be crowded or separated by half their diameter from one 

 another on the outgrowing edges, slightly ('5 mm.) or not at all firojecting, but always 

 distinct owing to the arched, slightly exsert, upper ends of the septa. Costae sunk in the 

 exotheca, edged with numerous, very rough, low spinules, giving a granular appearance. Septa 

 similarly very rough, as described by Ed. and H. Paliform teeth present or absent. Columella 

 always distinct, ending in papillae, or of a trabecular appearance. Exotheca very dense, in 

 places almost solid, with here and there relatively large cavities. 



Locality. (1) Turadu, S. Mahlosmadulu, W. reef, near breaker-zone, a rather smooth 

 incrusting mass, much studded with Pyrgoma up to the pores of which the corallum extends ; 

 (2) S. Male, 25/.; (3) Suvadiva, 31 /, and (4) Addu, 40/ on the outer slope, both the latter 

 rough with trabecular columella and very indistinct paliform lobes. 



G. II. 100 



