48 THE VOYAGE OF H.M.S. CHALLENGER. 
rather deep interspaces; and the calicular margin is thickened and neatly rounded. 
The surface is very strongly granulated. 
Localities. —St. Thomas, shallow water; Bermuda. 
2. Oculina pallens, Ehrenberg. 
Oculina pallens, Ehrenberg, Cor. roth. Meer., p. 79. 
+5 » Dana, Zoophytes, p. 395. 
As pointed out by Pourtalés, the species is distinct from Oculina diffusa, of which 
Milne-Edwards and Haime had supposed it a synonym; it is, however, closely allied to 
that species. The specimen obtained consists of a loosely ramose corallum about 30 cm. 
high, with long spreading branches somewhat attenuated at the extremity, and sparsely 
coalescent. Ehrenberg gives the width of the calicles as 13 lines and Dana as 14, but this 
would seem to vary very much at different parts of the corallum. On the thick branches 
the calicles are circular and about 3 to 3°5 mm. wide, while on the branchlets and apical 
parts they become oblique and are longer and narrower, the long diameter being often as 
much as 4mm. The septa are very uneven and exsert; the primaries and secondaries very 
strong and wide and project far towards the centre of the calicle, the pali being scarcely 
distinct paliform teeth which are often very small, especially in the apical oblique calicles 
where the septa become more exsert, and like the coste curve towards the distal part of 
the branches. In these apical calicles, the septa towards the distal parts are very markedly 
longer and inclined. 
The drawings of the calicles on pl. i. fig. 17, in the Report on the Florida Reefs ' 
are fairly good, but figs. 14 and 15 are misleading, owing to the indistinctness of the 
essential structure of the calicles. In these drawings the septa should be prolonged 
almost to the centre, with very small and thin pali; while in the oval calicle the distal 
septa should be enlarged, elongated and curved. 
The deeper, less prominent calicles which are oblique at the distal parts, the very 
exsert and large septa, and the slightly developed pali apparently separate this species from 
the Oculina varicosa, to which it is, however, very closely allied. 
Locality.— Bermuda. 
3. Oculina varicosa, Lesueur. 
Oculina varicosa, Lesueur, Mém. du Mus., vi. p. 291, pl. xvii. fig. 19. 
35 55 Dana, Zoophytes, p. 394. 
Four specimens of this species were obtained, three of which are very large, with 
extremely elongated branchlets, sometimes more than 30cm. long. The calicles are 3 to 4 
1 Agassiz, Mem. Mus. Comp. Zodl., Cambridge, U.S.A., vol. vii. No. 1. 
