742 ^ MB. J. STANLEY GARDHSTEB ON [June 6, 



spreading masses, 3-5 feet in diameter, small colonies only being 

 found on the reef. Specimeias a, b, c, and d. 



The specimen " a " is a small hemispherical colony from the boat- 

 channel, 7 cm. across by 5 cm. high. Its calices are generally 

 circumscribed, the longest series being 2 cm. The theca is veiy 

 thin, except in a few calices near one edge, and the columella 

 is represented only by a few spines in the valleys. Breadth of 

 the valleys 5 mm. ; depth of same 4-5 mm. Septa, 10 in 1 cm. ; 

 tertiaries seldom present. 



" h " is the peripheral growing-part of a large mass from the 

 boat-channel, of which the greater part has been killed. The 

 calices are seldom circumscribed, and the series vary up to 5 cm. 

 in length. The theca is very thin, and the columella is very 

 small, with a few spines on its surface. Breadth of the valleys 

 5 mm. ; depth of same 4-5 mm. Septa, 12-18 in 1 cm. (Plate 

 XLVI. fig. 1.) 



" c " is a small colony, similar and nearly equal in size to " a," 

 from the edge of the reef. The calices form convoluted series 

 about 2 cm. long. The theca is commonly about 1*5 mm. thick, 

 and the columella is often of the same breadth, being formed of 

 coarse trabeculse. Breadth of the valleys 6-7 mm. ; depth of 

 same 4 mm. Septa, 11 in 1 cm. 



"cZ" is a colony 12 cm. long by 6 cm. broad by 5 cm. high, 

 from the reef-flat. The calices generally form linear series up to 

 3 cm. long. The theca is 1-3 mm. in thickness, and the columella 

 is about I'o mm. broad, formed of almost spongy trabeculse. 

 Breadth of the valleys 6-7 mm. ; depth of same 5-6 mm. Septa, 

 11-12 in 1 cm. (Plate XLVI. fig. 2.) 



2. CcELORiA SINENSIS Milne-Edwards & Haime. (Plate XLVI. 

 %. 3.) 



Astroria sinensis, Milne-Edvs^ards & Haime, Ann. des Sc. Nat, 

 ser. 3, xi. p. 298 (1849). 



Ooehria sinensis, Milne-Edwards & Haime, Cor. ii. p. 416 (1857). 



This species has the same mode of growth as 0. dcedalea, but 

 may be distinguished from it by its thinner and more perfect theca 

 and smaller dimensions. The calices vary in a similar manner to 

 those of C. dcedcdea. The septa are very fine, seldom more than 

 1 mm. exsert, almost flat-topped, with vertical edges and fine 

 denticulations. Three cycles of septa are present, of which the 

 primary and secondary fuse with the columella. The latter is 

 feebly developed, covered on the surface with a row of small, fine, 

 irregular spines, and formed by fine trabeculse from the septal 

 edges, never forming a plate as in C. dcedalea. 



Breadth of the valleys 4-5 mm. ; depth of the same 3-4*5 mm. 

 Septa, 13-15 in 1 cm. 



Eunafuti ; two specimens — the one a round mass, 16 cm. in 

 diameter, with narrow much-eroded stem, obtained by the use of 

 Priestman's grab from 7 fathoms, outside the reef, and the other 

 the edge of a spreading mass from a lagoon-reef. 



