420 Happon—The Actiniaria of Torres Straits. 
Anemonia Ramsayi (H. & 8.). 
(Pl. XXII., figs. 3,4; Pl. XXVL, figs. 6, 7.) 
Condylactis Ramsayi, Wadd. and Shackl., 1893, Proc. R. D. 8., vu., p. 124. 
? Gyrostoma Hertwigi, Kwietn.* 
Form.—Column soft, about as high as broad, terminating above in a well- 
marked parapet, but without marginal spherules or suckers ; disk flat, considerably 
wider than the column, can be slowly but completely retracted; mouth circular, 
with a variable number of gonidial grooves (2-7); tentacles numerous, relatively 
short, about one-third of the diameter of the disk. 
Colour.—Column usually olive-brown or green, occasionally pale magenta 
pink; disk translucent, olive-brown or cinder colour; stomatodzeum whitish ; 
* T venture to give Gyrostoma Hertwigi, as a synonym of this species; but as will be seen from the 
following translations of Kwietniewski’s definitions (Ein Beitrag Zur Anat. Syst. Actin., Inaug.-Dissert. 
Jena, 1897, pp. 27, 30), he regards this form as the type of a new tribe of Actiniaria. It does not appear 
that more than one specimen was examined, and I can testify as to the variability that occurs in the 
number of the directive mesenteries. ‘ 
Tribe.—ISOHEXACTINIA, Kwietn. 
Actiniaria, with numerous paired mesenteries, which are arranged with radial symmetry on the 
hexradiate type. With six pairs of primary mesenteries, all of which bear longitudinal muscles on the 
sides turned away from each other. The remaining pairs of mesenteries have their longitudinal muscles 
on the sides turned towards each other. The body musculature consists of an endodermal circular muscle 
layer; the ectodermal musculature is confined to the oral disk. 
Family.—Gynrostomipm, Kwietn. 
(With the characters of the Tribe.) 
GYROSTOMA, Kwietn. 
Gyrostomid, with a smooth body-wall, the upper border of which is raised into a distinct fold. The 
oral disk wide, round, provided with short, conical, pointed tentacles, which are arranged alternately, not 
in rows. Mouth round. The cylindrical cesophagus with six siphonoglyps. Mesenteries numerous, 
mostly perfect; all the mesenteries of the higher cycles provided with gonads and mesenterial filaments. 
A feeble, diffuse, endodermal sphincter muscle. 
Gyrostoma Hertwigi, Kwictn. 
Thursday Island, Torres Straits; collected by Prof. R. Semon, 
