256 DISCOVERY REPORTS 



C. indicus, Schepotieff. Colony diminutive, in the form of a small round plate; 

 diameter 7 to 10 mm., height 3 to 4 mm. Ostia without any definite peristomial lip. 

 Length of zooid 2-2 mm., arms three pairs, no end-swellings with refractive beads. 

 South coast of Ceylon and Mahe (Malabar coast of India). 



C. fumosus, n.sp. Colony in the form of a flat cake-like mass formed by agglutination 

 of minute sand particles. Tubes vertical and parallel, with triangular peristomial lips. 

 Length of zooids 3-2 mm. ; dorsal side of body light brown. Arms eight pairs, with two 

 black bands in the axis. No end-swellings with refractive beads. Buds on each zooid 

 up to ten. Off Cape Bowles, Clarence Island. 



C. solidus, Andersson. Colony not branching, in the form of a bulky mass or cake, 

 measuring up to 300 mm. across, and 100 mm. high; the mass consisting of closely set 

 vertically disposed tubes each with an ostium and peristomial tube at the upper end. 

 The common coenoecial substance with or without sand grains. Length of zooid 4 to 

 5 mm. Colour of preserved zooid blackish. Arms eight pairs; no end-swellings with 

 refractive beads. North of Joinville Island and off Mertz Glacier, Adelie Land. 



C. densus, Andersson. Colony in the form of a bulky mass or cake, measuring up to 

 70 mm. high, consisting of closely set vertically disposed tubes of uniform diameter, 

 each with transverse ostium at upper end. Common coenoecial substance soft and 

 spongy, with or without sand grains. Length of zooids 4 to 1 1 mm. Colour of preserved 

 zooids greyish or brownish white. Arms usually eight pairs. Buds on each zooid up to 

 fourteen. Graham Land region, south-east of Seymour Island; Palmer Archipelago; 

 off Queen Mary Land; McMurdo Sound, Ross Sea. 



C. rarus, Andersson. Probably a synonym of C. densus. 



C. anderssoni, Gravier. Colony a ragged bulky mass, measuring up to 105 mm. 

 across ; consisting of radially disposed tubes of uniform diameter, each with a transverse 

 ostium devoid of peristomial lip. Basal parts of tubes cemented by common coenoecial 

 substance into groups of four or five ; partly incrusted with sand grains. Length of zooid 

 4 to 4*5 mm. Arms in buds six pairs, number in adult doubtful. South of Jenny Island, 

 near Adelaide Island. 



Sub-genus Idiothecia, Ridewood 



Colony branching, each ostium leading into a tube occupied by one zooid and its 

 buds. Tubes embedded in common coenoecial substance, and disposed at a more or 

 less constant angle to the surface, either blind at their inner ends, or connected up in 

 the middle of the branch. 



C. nigrescens, Lankester. Colony branching, branches roughly cylindrical, colour 

 greyish translucent; ostia at the end of short tubular peristomes, abaxial edge of peri- 

 stome produced into a blunt lip. No spines. Each ostium leading into a tube which ends 

 blindly in the middle part of the branch. Length of zooid 4 to 6 mm. Arms usually 

 seven pairs, sometimes six or eight pairs, axis of arms with two black bands; no end- 

 swellings with refractive beads. North-east of Coulman Island, Victoria Land; south 



