Happon—The Actiniaria of Torres Straits. 461 
Paraphellia Hunti, H. & S. 
Paraphellia Hunti, Hadd. and Shackl., 1893, Proc. R.D.S., vit. p. 129. 
(Pl. XXIII, fig. 26; Pl. XXTX., figs. 6-9.) 
Form.—Body columnar, very contractile, when fully contracted like a scab ; 
oral disk but little exceeding the diameter of the column; tentacles short in four 
’ eycles (6 + 6 + 12 + 24); mouth with two gonidial grooves. 
Colour.—Column mealy pink, with twelve longitudinal grey bands—of which 
six are broader, and six narrower, tentacles whitish with pale grey bands; oral disk 
tawny orange along sides of mouth, remainder variously pencilled with white, 
dark grey, and black, often a series of black spots up some of the white radu; 
mouth with five dark spots at each side, and a white one at each end; cesophagus 
creamy orange. 
Dimensions ——Height of column about 10 mm., average diameter 8 mm. 
Habitat.—Passage between reefs, Murray Islands; 15 fathoms. 
Tentacles—The ectoderm of the tentacles is very thick, and transversely 
wrinkled: the nematocysts form a distinct outer layer; then follows a thick 
granular or nucleated layer; below this is a clear layer; and finally the 
muscular layer, supported by well-developed plaits of the mesoglea. The 
mesoglcea is moderately thick. The endoderm is not so thick as the ectoderm, 
and is without zooxanthellae; the endodermal muscular layer is supported on 
simple mesogloeal processes. The structure of the disk is similar to that of the 
tentacles. 
Column.—The ectoderm is very thin, and contains dark-brown granules. The 
mesogloea is moderately developed. The endoderm has no zooxanthelle. No 
cinclides were observed. 
Sphincter. —The sphincter (Pl. xx1x., fig. 6) consists of a large number of rounded 
muscle cavities, numerous above (fig. 7), and gradually diminishing proximally 
GR xxix,, fic..8) 
Mesenteries—The mesenteries have the usual arrangement of the family, with 
the following formula: 6 + 6 +124 24. Of these, the second and third cycles 
are fertile; the fourth cycle consists of very minute mesogloeal projections, which 
do not extend beyond the endoderm. The retractor muscles are not powerful ; 
they consist of slightly branched plaits, which extend a considerable distance 
along the mesenteries (PI. xxrx., fig. 9). The parieto-basilar muscle consists of a 
few simple plaits on both sides of the mesentery, which are better developed on the 
side which bears the retractor muscle. Acontia are present, but not numerous in 
the lower portion of the ccelenteron. 
