SPECIES OF CEPHALODISCUS. 9 
even sunk below the general surface; spines long, not very obviously related 
to the ostia; width of spines about 5mm. Polypides colourless; all known 
individuals are female. Front of buccal shield to end of visceral mass 1°5 mm. 
Plumes six pairs, axis of each terminating in an end bulb with refractive 
colourless beads. Stolon not so long as the rest of the polypide in the contracted 
condition, commonly directed towards the mouth. Buds, one or two, rarely 
three. Free ova ‘33mm. across. 
Species hodygsoni. Material. ight specimens dredged by the ‘ Discovery’ 
in the Antarctic Ocean in 1902-3, in 100 to 300 fathoms. New species. 
Tubarium. Colony irregularly and closely branched (fig. 1, plate 2); distance 
TExt-FiGuRE 5.—Cephalodiscus gracilis, portion of a colony (x 5). The dark bodies are the polypides and 
embryos. The cavity of the tubarium is continuous, and opens by numerous ostia. (Copied from Harmer, 
10, plate 2, fig. 15.) 
from one branch to the next about 10 mm.; width of branch about 6 mm.; 
cavity of tubarium with inner surface smooth ; ostia oval, 3°3 by 2°3 mm., with 
four or five long, radiating spines, simple or forked ; width of spines °6 to 1 mm. 
Polypides colourless ; males, females, and hermaphrodites (one ovary and one 
testis), indistinguishable externally ; front of buccal shield to end of visceral mass 
2mm. Plumes six pairs, axis of each terminating in an end bulb, with refractive 
colourless beads. Stolon curved forwards or backwards, average length in 
contracted state 2mm. or less. Buds two, sometimes three or four. Free ova 
*45 mm. across, 
Species gracilis. Material. One specimen, obtained at Station 89 of the 
‘Siboga’ Expedition, East Coast of Borneo, on reef, between tide-marks. 
