258 DISCOVERY REPORTS 



partitions; occupied in common by zooids and their buds. Ostia numerous, irregularly 

 placed, oval and without peristomial tubes. Spines obviously not related to ostia, 

 simple, forked or branched. Length of zooids, 2 mm. Colour of preserved zooids, 

 whitish or cream-coloured. Arms usually six pairs, sometimes five pairs, with end- 

 swellings with refractive beads. Buds two or three. Straits of Magellan; east of 

 southern end of Tierra del Fuego, Beagle Channel; between Falkland Islands and 

 Burdwood Bank. 



C. hodgsoni, Ridewood. Colony irregularly branched, cavity of coenoecium irregular, 

 continuous and occupied in common by the zooids and their buds, inner surface smooth 

 and sometimes traversed by solid bars. Ostia numerous, irregularly placed, lateral or 

 terminal, each ostium with two to five more or less radiating spines, forked or branched. 

 Length of zooids 2 to 3-2 mm. Zooids dimorphic; red zooids with six pairs of arms, 

 females; brown zooids with ten or eleven arms, males. Arms with end-swellings with 

 refractive beads. Buds two, sometimes three or four to each zooid. Ross Sea, east end 

 of Barrier; in McMurdo Sound, south of Ross Island; Commonwealth Bay, Adelie 

 Land; off Shackleton Glacier, Queen Mary Land; Graham Land Region, south-east 

 of Seymour Island. 



C. inaequatus (Andersson). Regarded as synonymous with C. hodgsoni by Ridewood. 



C. aequatus, Andersson. Nearly related to C. hodgsoni and C. dodecalophus. Colony 

 irregularly branched and straggling; coenoecium containing diatoms in great numbers. 

 Length of zooids 2 mm. Colour of preserved zooids crimson-brown, fading to pale 

 brown. Arms, six pairs in both sexes, with end-swellings with refractive beads. Buds 

 two to four on each zooid. Graham Land Region, north of Joinville Island. 



C. gracilis, Harmer. Colony very small and delicate, irregularly branched, creeping 

 on a species of Polyzoa. Coenoecium almost colourless, the orange-coloured zooids 

 within imparting a yellow tint to the colony. Cavity of coenoecium continuous, occupied 

 by zooids and their buds in common. Ostia at the ends of branches, funnel-shaped; 

 margin produced into three, four or five spines. Length of zooids 1-3 mm. Stolon with 

 black pigment in the median line of the ventral surface. Arms five pairs ; end-swellings 

 with refractive beads found on the first pair of arms of the bud, occasionally on the 

 second and third pairs also, sometimes persisting in the adult. East coast of Borneo. 



C. sibogae, Harmer. Colony very small and delicate, irregularly branched, orange- 

 coloured with dense basal encrusting part of coenoecium attached to stones ; cavity of 

 coenoecium continuous, occupied in common by the zooids and their buds. Ostia at 

 the end of very short side branches, more or less alternate on opposite sides of the 

 branch, funnel-shaped, with margin produced into two or three spines. Ordinary 

 zooids, sterile, with large operculum and four pairs of arms. Male zooids with a single 

 pair of arms without any trace of pinnules ; the dorsal wall of the arms constituted by 

 large number of refringent vesicles ; the alimentary canal vestigial and the operculum 

 absent. Colour blackish. Zooids, which otherwise resemble neuters, sometimes with 

 functional testes. Northern entrance of Buton Strait, south-east of Celebes. 



