1899.] ASTB^TD OOftALS FJiOli THJ3 SOUTH PACIFIC. ?49 



polyps similarly coloured. The larger calices are 9-14 mm. in 

 diameter by 5-7 mm. in depth. The dividing-walls vary from 

 1-5 to 2-5 mm. in breadth, and have always a well-defined sulcus. 

 The septa form three complete orders, and there are sometimes a 

 few septa of a fourth cycle. The primaries and secondaries are 

 equal in size, about 2 mm. exsert, and have well-marked paliform 

 lobes. By the fusion of trabeculse from their septal edges, a well- 

 defined oval columella is formed. The under surfaces of both 

 specimens are covered by a distinct thin epitheca. 



Rotuma ; reef -flat and rim of reef. 



The specimen from the reef-flat has its calices broader and 

 shallower than the one from the rim. The paliform lobes in the 

 same specimen are also much more distinct and form a marked 

 crown round the columella, which is generally at least 2 mm. in 

 diameter. 



4. AsTRJEA OKENi Milne-Edwards & Haime. (Plate XLVII. 

 fig. 2.) 



Favia o^eni, Milne-Edwards & Haime, Cor. ii. p. 430 (1857). 



This species differs from the preceding in having broad dividing 

 walls (2-5-4 mm.) between its calices with very distinct sulci. 

 The corallites do not have any distinct raised rim, save that which 

 is formed by the nearly equally exsert upper ends of the septa, 

 of which there are three complete cycles. All the septa fuse with 

 the columella, the tertiaries a little lower than the primaries 

 and secondaries. All have distinct, bluntly angular teeth at 

 their lower ends, but these do not in any way simulate pali. 

 (PI. XLVII. fig. 2.) 



Eotuma ; boat-channel. 



5. Asthma puteoltna Dana. 



Astrcea puteolina, Dana, Zooph. p. 223, pl. xi. fig. 3 (1848). 



A single fiattened mass, the iucrusting base of which has been 

 eroded away. The mass is much incrusted by nullipores ; when 

 obtained, only the calices round the edges were alive. The 

 specimen differs from those of A. fragilis in the collection in 

 having larger calices, 11-13 mm. in diameter by 4-5-6-5 mm. in 

 depth. There are three complete cycles of septa, of which two 

 reach the columella. The walls are about 2 mm. thick, and the 

 septa of neighbouring calices are often continuous over them, the 

 sulcus being scarcely noticeable. The species is almost exactly an 

 enlarged edition of A. fragilis, but the septa and corallum, even in 

 the smallest calices (7 mm. in diameter), are much more massive. 



Funafuti ; lagoon shoals. 



6. AstRjEA lobata Milne-Edwards & Haime. 



Favia lohata, Milne-Edwards & Haime, Cor. ii. p. 434 (1857). 



Favia lobata, Klunzinger, Die KoraU. des E. Meeres, iii. p. 31, 

 pl. iii. fig. 9 (1879). 



Two specimens, which conform closely to the above descriptions, 

 and to some extent show the same features as the two specimens 



