Happon— The Actiniaria of Torres Straits. 493 
B. With the ultimate branches of the tentacles capitate : 
1. The sixteen (? thirty-two) long narrow lobes; each 
bear three or four ovoid stalked vesicles, which are 
beset with small capitate papille (Tonga), . . A, aleyonoideum. 
2. The forty-eight stout lobes bear numerous, spirally 
arranged, irregularly conical, complex tentacles, 
the branches of which have spherical heads (‘Torres 
Straits), . : ; ; ‘ : ; . A. glomeratum. 
Genus.—MEGALACTIS, Ehr. 
Megalactis, . Ehrenberg, 1834; Korallth. Rothen Meeres, p. 839; Andres, 
1884 ; Le Attinie, p. 302. 
Actineria, . M. Edwards, 1857, Hist, Nat. Cor. 1., p. 296; Klunzinger, 
1877; Korallth. Rothen Meeres, p. 90. 
Actinodendride, of large size, with a smooth, soft column; oral disk not 
broader than column; tentacles 6 + 6 + 12, long and thick, with numerous lateral 
ramifying relatively thick branches. The corona measures from 230-300 mm. 
(9 to 12 inches) in diameter. 
No specimen of this genus has been anatomically studied ; but we may, for the 
present, regard it as being nearly allied to, but quite distinct from, Actinodendron. 
M. Hemprichii, Ehr. M. Grifithsi, §.-K. 
Megalactis Griffithsi, S.-K. 
Megalactis Griffiths’, . S.-Kent, 1893, ‘The Great Barrier Reef of Australia,” 
pp. 35, 147, pl. xxii. B. 
Form.—Lobes of disk or ‘‘ tentacles” twenty-four in number, bearing laterally 
a large number of irregularly placed, relatively thick dendritic tentacles, the 
ultimate ramifications of which have pointed ends. 
Colour.—Tentacles usually a clear brown or French grey, with a distinct pale 
greenish stripe running up their centre; the basal halves of the tentacles of the 
specimens from Warrior Island photographed by Mr. Saville-Kent were alternately 
of a pale lilac and pale sea-green hue, the ultimate ramifications being grey and 
buff; the oral disk various shades of grey and buff with twenty-four radiating 
white lines with dark spots corresponding to the mesenteries; the six primary 
radii, that is those corresponding to the first cycle of tentacles, have a central 
