400 Happon—The Actiniaria of Torres Straits. 
gradually decreasing in size going backwards (ventrally); the two mesenteries 
attached to the bottom of the cesophageal groove (the directive mesenteries) are 
remarkably small, and are distinguished in this way from the other anterior (dorsal) 
mesenteries. Body-wall with strongly-developed ganglionic and longitudinal 
muscular layers. 
Family.—Cermantuipm, M. Edw. et Haime, 1852. 
Cerianthez with a double corona of tentacles, marginal principal tentacles and 
circum-oral accessory tentacles ; posterior end of body rounded ; with feeble trans- 
verse mesenterial muscles which are turned towards the directive mesenteries, the 
longitudinal muscles being turned away from them ; no sphincter. 
Cerianthus, D. Ch.; Saccanthus, M. Edw.; Bathyanthus, Andr. 
CERIANTHUS, Delle Chiaje, 1832. 
Cerianthide with an aboral pore ; with a sheath consisting of mud, sandgrains, 
and nematocysts, in which the posterior (proximal) end of the polyp les as if in a 
case. 
Cerianthus nobilis, H. & S. 
Cerianthus nobilis, Hadd. and Shackl., 1893, Proc. R. D.8. vim, p. 118; Saville- 
Kent, 1893; “‘ The Great Barrier Reef of Australia,” p 151, 
chromo pl. ii1., fig. 7. 
Form.—Body of great size, presence of a terminal pore not determined. 
Marginal tentacles long, tapering, in three cycles from about 160 to 170 in 
number, about 79 tentacles in the outermost cycle. Oral tentacles very numerous, 
much smaller than the marginal tentacles. 
Tube, thick, rugose, gelatinous. 
Colour.—Upper portion of body rich, deep brown; lower portion, creamy 
brown, with irregularly arranged, fine, longitudinal, brown lines, and one broad 
pale band. Marginal tentacles, deep flesh colour (No. 31 of Broca’s skin colours), 
with a broad or narrow line down each side. Disk, with radial brown lines, one 
radius being pale with two dark brown marks at the base of the corresponding 
tentacles. Oral tentacles more yellow than the marginal tentacles; ‘‘inner ten- 
tacles usually pearl-grey ; outer series most commonly pale lemon-yellow, varying 
to a dark red-brown or nearly black.”—S.-K. 
Size—Length of body probably about 300mm. (114 in.); of the preserved 
specimen 105mm. Diameter of living body about 26mm. (1 in.); of the 
preserved specimen 19mm. Length of marginal tentacles about 80 mm. (33 in.). 
Length of tube about 3845 mm. ; average diameter of tube in middle 36 mm. 
