454 Happon—The Actiniaria of Torres Straits. 
specimen of P. Sollasi described by Dr. Maguire. But in one sextant, one- and 
in another two-pairs of mesenteries of the fourth cycle are present; those in fact 
that are missing is the more typical arrangement. In the large specimen of 
P. Sollasi there is more irregularity in some exoccels; the order is 4 || |}, while 
in others a variable number of fourth-cycle mesenteries make their appearance. 
Phellia vermiformis, n. sp. 
(PIX XML, 5 fie 118, Pl. KXVINTS fies. 0,41.) 
Form.—Body elongated, worm-like, no distinct pedal disk; capitulum rather 
short; tentacles in 3 or 4 cycles, short, blunt, entacmzal, mouth linear. The 
acontia are few, and are feebly emitted from the mouth. 
Colour.—Body pink, yellowish above; capitulum and tentacles greyish. 
Dimensions—Length of preserved specimen, 95 mm. (33 in.); diameter of 
capitulum, 12 mm. 
Habitat.—Burrows in the sand, leaving only a short length of the upper part of 
the column exposed when expanded. Surface of reef, Thursday Island. 
The appearance of the species when preserved in alcohol is shown in PI. xxu1., 
fig. 18; in this figure the pedal disk is much more prominent than when alive. 
Body-wall—The ectoderm has a definite cuticle; the mesoglcea is thick and 
homogeneous. The mesoglea of the cesophagus is also thick; there are two 
cesophageal grooves. 
Sphineter.—The sphincter muscle (Pl. xxv, fig. 10) is long and mesoglceal, 
and lies close to the endoderm. It consists of a band of uniform width, broken 
transversely by numerous narrow strands of mesogloea at irregular intervals. 
Throughout the region of the sphincter the endoderm of the body-wall is pro- 
vided with strong muscular process, supported on slightly branched outgrowths 
of the mesogleea. 
Mesenteries.—The arrangement of the mesenteries has already been described. 
The formula is 6 +6+4+12+412=86, There is an exceedingly strong retractor 
muscle, the form of which varies in section; sometimes it is kidney-shaped, but 
fig. 11, Pl. xxvim, is very typical. 
Phellia sipunculoides, H. & S. 
Phellia sipunculoides, Hadd. and Shackl. 1893; Proc. R. D. 8. vu, p. 128. 
(Pl. XXIII., figs. 19, 20). 
Form.—Body, columnar; pedal disk, flat, adherent; scapus, coriaceous, 
tesselated ; capitulum, extensile, delicate; tentacles of moderate length and thick- 
