1910.] FROM MRRffUI ARCIIIPELAOO. 809 



tributed species has been describeil from the Indian Ocean only 

 by Billard, from IMacalouiiu, Mozamljique, 22 metres (1907 /;, 

 p. 338). 



Family C A m P A x u L A r i d /E. 



Campanularia corrugata Thornely. 



Except at Station 1 , where it was also associated with Sertu- 

 larella quadridens and Dlphasia digitalis^ this species always 

 occurred as an epizoon on Idia jyristis. 



Localities. St. 1, east of Tavoy Island and Port Owen, 4 to 12 

 fathoms, sand and broken shells, and mnd ; short and stout, 

 strongly ribbed hydrothecaj on Dlphasia digitalis, and long, cylin- 

 (Irical individuals on Idia pristis. Stt. 15 and 16, Ravenshaw 

 Island, Sir John Malcolm Island, and Alligator Rock, 5 to 18 

 fathoms, rock and sand, or rock and mud ; occasionally. St. 22, 

 Hastings Harbour, shore to 20 fathoms, rock and sand ; faii-ly 

 common. St. 23, Five Islands, 8 to 12 fathoms, rock and sand,, 

 and mud ; not common, St. 25, Gregory Group and Crichton 

 Island, 4 to 14 fathoms, stones and broken shells and rock: rare 

 cylindrical hydrothecfB with short stalks. St. 35, between Warden 

 Island, Howe Island, and Lyall Island, 15 to 20 fathoms, rock 

 and sand ; rare. 



Campanularia raridentata Alder, 1857. 



From British examples the majority of the specimens here 

 referred to C. raridentata difier in lacking the swelling which 

 intervenes between the base of the stalk and the stolon, in this 

 respect resembling examples recorded from areas so wide apart as 

 Calbuco, South America (Hartlaub, 1905, p. 567), St. Malo, France 

 (Markt.-Turner., 1890, p. 205), and the Indian Ocean (Hincks, 

 1889, p. 133, cf. pi. xii. lig. 5). From seven to eleven rings occur 

 at the base of the stem, and from thi'ee to five underneath the 

 hydrotheca, and sometimes a few annulations mark also the 

 middle portioia of the stem. The margin of the hydrotheca 

 appears to l)e divided into from five to seven large teeth, the 

 extreme tenuity and transparency of which render them difficult 

 to observe. The hydranth bears twelve to thirteen tentacles. 



No gonosome was observed. 



The dimensions of the Mergui specimens are much less than 

 those of St. Malo specimens recorded by INIarktanner-Turner- 

 etscher (1890, p. 205), and approach most closely those of a single 

 example from Saint- Vanst described by Billard (1907 «, p. 173), 

 with which they also agree in possessing few hydrotheca! teeth. 



Dimensions, in mm. : — 



St. 1. St. 23. 



Stem, length 0-59 0-35-0-45 



„ diameter 0-07 0-04-0-06 



Hydrotheca, depth 0-50 0-29-0-41 



,, diameter at mouth 0-17 0-13-0-15 



