10 W. G. RIDEWOOD. 
Described by Harmer in Report of ‘ Siboga’ Expedition (10). Tubarium.* Colony 
very small and delicate ; almost colourless tubes, of prostrate habit, supported by 
foreign object (calcareous branches of the Polyzoon 7) ubucellaria). Extremities of 
the branches with long spines borne upon the margins of the funnel-shaped ostia, 
which measure ‘8 to 1 mm. across. Width of branches 1 to 1°5 mm. (text-fig. 5). 
Polypides. All known individuals are female. Front of buccal shield to end of 
visceral mass *87 to 1°2 mm. Plumes five pairs, small end bulbs with refractive 
beads present in first pair of arms of the bud, and occasionally on second and 
third pairs also; they may persist in the adult (10, p. 20). Stolon thin, much 
longer than the rest of the polypide, usually directed away from the mouth, and 
producing buds in great profusion. ree ova *3 to “4 mm. across. 
Species sibogae. Material. One specimen, obtained at Station 204 of the 
‘Siboga’ Expedition, at the Northern entrance of Buton Strait, off 8.E. point of 
Celebes, in 75 to 94 métres. Bottom sand with dead shells. Described by 
Harmer in Report of the ‘Siboga’ Expedition (10). Tubarium with a dense basal 
encrusting portion, growing on a small rock, with stiff, erect and slightly branched 
tubes, with numerous foreign inclusions in the substance of the test. Ostia 
funnel-shaped, more or less alternate on two opposite sides of the branch, *6 mm. 
across, produced into a few peristomial spines, stiffer and shorter than those of 
C. gracilis, Width of branch 1 to 2 mm. (text-fig. 2). Polypides deeply pig- 
mented ; all known individuals are male or neuter. Neuters with elongated trunk 
region, with excessively long and slender stolon arising from near its aboral end, 
and producing buds in great profusion ; gonads vestigial in buds, usually absent 
in adults, but occasionally developed into functional testes (10, p. 84, and legend 
to fig. 98). Plumes four pairs, without end bulbs and refractive beads. Front of 
buccal shield to end of visceral mass *95 mm. Males with conical body, which 
passes continuously into the stalk; alimentary canal vestigial; testes occupying 
most of the trunk and part of the stalk. Plumes one pair, without pinnules, 
surface with crowded refractive beads, at least in young males. ree ova not 
known. 
Sub-genus Jdiothecita. Cavity of the tubarium multiple; each ostium leading 
into an unbranched, tubular cavity occupied by one polypide and its buds, and having 
no connection with the other cavities of the tubarium. 
Species nigrescens. Material. Several specimens, obtained by the 
‘Discovery’ in 1902 off Coulman Island, near Victoria Land, in the Antarctic 
Ocean, in 100 fathoms. Described by Lankester in Proc. Roy. Soc. (15). 
* In drawing up this table the distinctive features of C. gracilis, C. sibogae and C. levinsent have been 
culled from Harmer’s monograph; an independent examination of his specimens was not made. It is to be noted 
that Harmer’s orientation of the polypide is not accepted; the surface of the body which he terms anterior is 
here spoken of as ventral. 
