70 THE VOYAGE OF H.M.S. CHALLENGER. 
division into smaller parts for new branches; the verrucee are less crowded in this 
specimen than is usual in the species, being rather short and subequal, rarely elongat- 
ing. The calicles are very close, separated by very thin interspaces, more wide apart on 
the verruce and on the basal parts of the branches where narrow septa and a pointed 
columella are developed. Ccenenchyma scarcely compact, except on the superficial basal 
parts and on the verrucze. 
Dana’s figure “2 a” gives a very exact idea of the character of the branches near the 
apex, except that the intercalicinal spaces are rather wider than is usual. 
Tahiti. 
Locality. 
Subsection ASTRAKIDA. 
Family AstR&ID. 
Genus 1. Cladocora, Ehrenberg. 
Cladocora, Ehrenberg, Cor. roth. Meer., p. 85. 
5 Milne-Edwards and Haime, Cor., ii. p. 587. 
> Duncan, Rey. Madrep., p. 70. 
Cladocora arbuscula (Lesueur). 
Caryophyllia arbuscula, Lesueur, Mém. du Museum, vol. vi. p. 275, pl. xv. fig. 2. 
A single specimen was obtained in shallow water. Pourtalés records that it is found 
in quantities on muddy shoals. An interesting fact is the occurrence of the same species 
in 10 to 20 fathoms as far south as Simon’s Bay, Cape of Good Hope, recorded by 
Professor Moseley. Very good figures of the species are given by Agassiz, Florida 
Reefs, pl. ii. figs. 1-7. 
Locality.—St. Thomas, West Indies. 
Genus 2. Galaxea, Oken. 
Galaxea, Oken, Lehrb. der Naturg., i. p. 72. 
35 Milne-Edwards and Haime, Cor., ii, p. 223. 
5 Dunean, Rev. Madrep., p. 118. 
Eight species of this genus were obtained. 
1. Galaxea clavus (Dana). 
Anthophyllum clavus, Dana, Zoophytes, p. 403, pl. xxviii. fig. 3. 
One living incrusting specimen and a few small dead and somewhat worn specimens, 
over which Seriatopora valida and Millepora murrayi have grown, seem referable to 
