492 Happon—The Actiniaria of Torres Straits. 
Actinodendron glomeratum, n. sp. 
Actinodendron aleyonoideum (Q. & G.), Hadd. and Shackl., 1893; Proce. 
EDS: Walls, pe llr. 
(Pl. XXIV., figs. 7-9.) 
Form.—Very similar to A. plumosum; but the prolongations of the oral disk 
are thicker, and the tentacles, with their branches, form irregularly conical bossy 
agglomerations, which are spirally disposed on the lobes; the branches have 
delicate stalks with a spherical head. 
Colour. —Column a uniform dull greenish yellow, with paler vertical lines; 
oral disk central portion greyish, with irregularly disposed translucent spots. The 
primary radii deep green near the greyish centre, but becoming paler in colour 
peripherally, and extending as the lobes, with a pale creamy green colour; these 
radii are sparsely spotted with lilac or pale magenta. Between these are narrow 
radial bands, with dark spots. Lobes of disk pale creamy green above dark slaty 
or a deep green laterally ; tentacles pinkish grey, with greenish tips. 
Dinensions.—Diameter of corona, 200 mm. (8 in.). 
Habitat.—Reef, Mer. 
This is a rare species, and quite distinct from the other and common species. 
In the preliminary description these two species were identified respectively 
with the A. arboreum and A. alcynoideum of Quoy et Gaimard, as we did not wish 
to run the risk of burdening the literature of the subject with superfluous syno- 
nyms. Even now I cannot feel quite certain on this point, as it is possible that 
the original figures may be drawn inaccurately, and the descriptions are not quite 
explicit enough. On the whole, I think it is best to adhere to my original impres- 
sion in the field, and to regard the Torres Straits’ specimens as new species. 
I have, however, not hesitated to re-define the genus so as to conform with 
my species. 
The species of the genus, then, are :— 
A. With the ultimate branches of the tentacles more or less bilobed : 
1. The ten very long and thin lobes of the oral disk ; each 
bear five or six ovoid stalked vesicles, which are 
beset with small bifid papilla. The column has 
a distinct upper margin (New Guinea), : . A. arboreum. 
2. The forty-eight moderately long lobes bear numerous 
dendritic tentacles. The column passes insensibly 
into the lobes (Torres Straits), . : : . A, plumosum. 
