744 MR, J. STAKLET GABDTirETl O^ . .;: •-. 



5. CosLOEiA BDWAB.DSI, n. sp. (Plate XL VI. fig. 6.) 



The corallum has the same general mode of growth as in 

 C. dcvdalea, but appears primarily to form low, almost flat, spread- 

 ing masses. The calices are seldom circumscribed, but form long 

 valleys, which are generally sinuous in the centre of the mass, but 

 towards the periphery are almost straight, radiating from the 

 centre and occasionally branching. The epitheca is distinct, but 

 thin and imperfect, with no concentric markings. 



The theca varies little in thickness, being at the level of the 

 columella about 1 mm. in breadth. It is formed of dense corallum, 

 and gi'ows rather by the deposition of corallum on its upper edge 

 than by thickenings of the septal sides. The septa are very 

 regular, unifoi-m in size, and rather thick, falling into two cycles, 

 the tertiaries being seldom represented. They are continuous 

 over the walls between the serial calices, being uniformly about 

 1 mm. exsert. The upper edges of the septa above the theca are 

 very uniform, from 2-3 mm. broad, and nearly horizontal ; the 

 edges then slope abruptly to the columella on each side, and large 

 teeth are absent. 



The columella is always distinct in the valleys, about 1 mm. 

 broad. From the surface it looks like an irregular broad row of 

 low spines, but in section is seen to be formed by fine filamentous 

 trabecula; from the septal edges. The interseptal loculi are very 

 deep, endothecal dissepiments being seldom found within 1"2 cm. 

 of the surface of the colony. 



Breadth of the valleys 5-6 mm., usually 5 in 2-7 cm. ; depth of 

 the same, from the surface of the columella to the upper edges of 

 the highest septa, 3-4 mm., often less near the edge of the colonv. 

 Septa, 11-12 in 1 cm. (PI. XLVI. fig. 6.) 



Eotuma ; reef (?). Funafuti ; lagoon-shoal. 



The Eotuma specimen is a flat colony, 19 by 16"5 cm., about 

 6 cm. thick iu the centre, gradually thinning towards the exterior. 

 The Funafuti specimen is the edge of a mass 6 cm. thick, the 

 central part of which was killed and overgrown by sponges ; it 

 hence does not exhibit the same regular arrangement of the 

 valleys, and its septa also are rather thinner. 



Genus Hydnophoea. 

 Hydnophora, Milne-Edwards & Haime, Cor. ii. p. 418 (1857). 



1. Htdnophoea MiCEOCOisrA Lamarck. 



Monticularia microconos, Lamarck, Hist, des Anim. s. Vert. ii. 

 p. 251 (1816). 



Eydnopliora microcona, Milne-Edwards & Haime, Cor. ii. p. 423 

 (1857). 



Hydnophora microcosm, Klunzinger, Die Korall. des E. Meeres, 

 iii. p. 21, pi. iii. fig. 1 (1879). 



I found this species to be by far the n}ost abundant coral 



