Hapvpon—The Actiniaria of Torres Straits. 479 
The endoccels and exoccels are of equal size, and, owing to this and the very 
slight development of the longitudinal muscles, it is very difficult to orientate the 
pairs properly. Only one pair of directives was present in one specimen, and 
probably only one pair in another specimen, while in a third specimen no directives 
were present. Although the cesophagus is raised into strong folds, gonidia could 
not be distinguished. The circular muscles of the column are throughout exceed- 
ingly feebly developed, and no special sphincter muscle is present. 
My observations agree very closely with those of M*Murrich, except that I can 
demonstrate a feeble diffuse sphincter (Pl. x1., figs. 1, 2). 
A. Sancti-Thome, D. & M., 1860. 
A. bryoides (H. & 8.), 1893. 
A. mussoides (?) (S.-K.), 1898. 
Actinotryx bryoides (H. «& S.). 
Rhodactis bryoides, Hadd. and Shackl., 1893; Proc. R. D. 8. vm, p. 121. 
(Pl. XXV., figs. 1-3; Pl. XXXII, figs. 7-9). 
Form.—Body salver-shaped, with a well-marked crenulated parapet ; oral disk 
expanded, of even contour, concave with prominent oral cone; mouth rounded, 
stomatodzeum with twenty-four furrows, but no gonidial grooves; one or two 
short, knob-like tentacles on most of the crenulations of the parapet ; but the bulk 
of the tentacles are compound, and are grouped in numerous radial lines, twelve 
of which run up the oral cone; there is an annular clear space between the centri- 
petal and the peripheral tentacles. 
Colour.—Column buff, greyish brown, or cinder-colour; disk burnt-sienna colour ; 
tentacles various shades of bluish green, some on the disk brown; the peripheral 
knob-like tentacles on the crenulations of the disk are greenish; cesophagus grey 
or pinkish. 
Dimensions.—Diameter of disk about 32 mm. (1+ in.). 
Habitat.—Surface of reefs, Murray Islands. 
Sometimes this species is found erect and salver-shaped (PI. xxv., fig. 1); at others 
it occurs partially imbedded in the sand, in such a way that the perphery of the 
oral disk touches the ground; the outer quarter of the disk forms the lip of a 
shallow crater, in the centre of which rises the oral cone, with a circular open 
mouth (Pl. xxv., fig. 2). The crenulation of the periphery of the oral disk consists 
of a larger and a smaller series; about seven or eight of the latter occurring 
between each of the former (PI. xxv., fig. 8). The disk is only slightly retractile. 
The very numerous dendritic tentacles on the oral disk give a mossy appear- 
ance to the polyp; the surface of the disk is mottled with various shades of green, 
