Happon—The Actiniaria of Torres Straits. 451 
Sagartia Plebeia, n. sp. 
(PIS, fig) 17; Pl. XXIX., fig. 12). 
Form.—Column smooth, soft, columnar; oral disk, of about same diameter as 
column or slightly wider; tentacles probably in four cycles, simple, conical, about 
same length as diameter of oral disk; oral disk raised to a central cone; mouth 
linear, one oral groove. Acontia are emitted through lateral or basi-lateral 
cinclides which are not evident. 
Colour.—Column reddish buff, with thin, vertical, pale, and dark streaks; 
tentacles umber-brown, with a few irregular cream-coloured spots, usually with an 
irregular band of white spots at base; oral disk translucent; the gonidial radius 
nearly white, a white line round the mouth; cesophagus reddish buff. 
Dimensions.—Height of column, about 25 mm. (1 in.); diameter, 10 mm. ; 
diameter of corona, about 45 mm. (12 in.). 
Habitat—Reef, Murray Islands. 
Owing to an unfortunate mistake only vertical sections were made of the 
single specimen obtained. ‘The sphincter muscle (Pl. xx1x., fig. 12) is strong and 
comparatively short, its distal portion forms a prominent external swelling in 
the sections. 
GEPHYRA, Koch. 
Sagartiinee with an expanded pedal disk that clasps zoophytes; the diameter 
of the disk considerably exceeds that of the column ; tentacles not very numerous, 
and moderately short. 
G Dohrnii, Koch. 
CEREUS, Oken. (Heliactis, Thompson). 
‘Column very changeable in form, capable of becoming tall, pillar-like, or 
contracting to a low, depressed cone ; no submarginal fold; upper part with small 
inconspicuous, contractile suckers; walls nearly smooth, pierced by scattered, 
inconspicuous pores or cinclide. Disc broadly expanded, wider than the column, 
sometimes undulated at the margin. Tentacles numerous, more or less scattered 
on the disk, usually rather stout, the inner ones considerably largest; the outer 
ones quite small. Type C. bells” (Verrill, 1869, p. 480). 
Verrill (Trans. Connect. Acad. I. 1869, p. 480) correctly restores Oken’s 
genus. Thompson (P. Z. 8. xxvi., 1858, p. 145; and A. M.N. H. (3), 1, 1858, 
p. 229) erected a new genus, Heliactis, which must lapse ; and his identification of 
38 U 2 
