428 Happon—The Actiniaria of Torres Straits. 
of mesenteries; of these, those nearest to the directives would probably later 
have formed complements to those directives, and so two pairs of directives 
would result. This is probably what has occurred for directives, D® D* of 
LO. 
Gonads.—Any of the larger mesenteries may be fertile, including those that 
evidently belong to the primary cycle. In one female specimen the four pairs of 
directives are fertile, but in other specimens no gonads could be discovered 
with certainty on the directives. 
This species is certainly nearly allied to A. Dixoniana, but I think it is a 
distinct species. 
Actinioides Sesere, H. & S. 
(Pl. XXIL, figs. 8,9; Pl. XXVIII., figs. 1-2.) 
Actinioides Sesere, Hadd. and Shackl., 1893; Proc. R. D.8., vii, p. 126. 
Form.—Column, smooth, with about 24 vertical rows of verrucee, which are 
small below, in the upper portion of the column these are larger, and somewhat 
irregular in their arrangement; capitulum, provided with well-defined, conical 
acrorhagi (Pl. xx11., fig. 9); disk flat; mouth round, raised on small cone, with no 
gonidial grooves. 
Colour. —Column various shades of brown and gray; verruce bright green ; 
acrorhagi light green, with dark spots; tentacles, inner rows brown and faintly 
banded, outer row brownish white, with green sheen, with a black spot at their 
base ; oral disk brown, with white or pale green radial lines, which usually unite in 
a spot at the base of the tentacles. 
Dimensions.—Height of column 10 mm. ; diameter of corona 30 mm. 
Habitat.—Crevices and holes in stones on the shore, Mabuiag. 
Externally this species can be readily distinguished from the other species 
of the genus; the general green colour and the bright green spots are very 
characteristic. 
Sphincter Muscle-—Not less characteristic is the sphincter muscle (Pl. xxvmt., 
fies. 7, 8); at first sight it looks as if it should be classed as cireum- 
scribed ; although it is rounded in section, the mesoglceal plaitings do not 
all arise from a common stem, but there are several main plaits. Of the 
described species of Actinioides, A. Papuensis has the simplest sphincter; then 
follow A. Spenceri, A. Dixoniana, and A. Sesere, is the most specialised. 
