810 MR. J. niTcniE OS HTDROiDS [May 24, 



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

 fathoms, sand and broken shells, and mud ; rare. St. 25, Five 

 Islands, 8 to 12 fathoms, rock and sand, and mud; i-are. St. 35, 

 between Warden Island, Howe Island, and Lyall Island, 15 to 20 

 fathoms, rock and .sand ; rare. 



Except from St. 23, where this species also occurs on Seriularella 

 quadridens, specimens are confined to Idia pristis. 



From each of Stations 1 and 28 comes a solitary simply-stalked 

 hydrotheca with cone-shaped basal portion, surmounted by almost 

 cylindrical walls terminating in seven or eight sharp teeth. The 

 structure of the basal portion resembles that of the hydi-otheca of 

 Ohelia andersoni Hincks, but I regard the present specimens as 

 abnormally developed examples of C. raridentata. 



Hebella calcarata a. Agassiz, 1865. 



One of the most widely distributed of the species in the collec- 

 tion, occurring at eight of the fourteen stations from wliich 

 Hydroids were obtained. It shows considerable diversity of 

 form, being usually represented by the long smooth hydrothecw of 

 the typical form, but frequently assuming the shape of the variety 

 recorded by Marktauner (1890) as Lafoea contorta. This epizoio 

 species, like several others, shows a remarkable constancy of 

 preference for Idia pristis, seeing that at all stations, with the 

 exception of Station] 9, where it was creeping on Thi/roscyphus 

 vitiensis, it occurred on that species, and on it alone. 



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

 fathoms, sand and broken shells, and mud ; not common, often 

 var. contorta. St. 9, between Bentinck Island and Courts Island, 

 12 to 26 fathoms, sand and shells. St. 14, Bushby Island 

 pearling-ground, shore to 21 fathoms, sand and mud ; rare. 

 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 present, often assuming the shape of var. contorta. 

 St. 23, Five Islands, 8 to 12 fathoms, lock and sand, and mud ; 

 very common, mostly var. contorta. St. 25, Gregory Group and 

 Crichton Island, 4 to 14 fathoms, stones and broken shells, and 

 rock ; very rare. Moskos Islands, 3 to 26 fathoms, rock and 

 sand, or rock and mud ; common. 



Hebella ckateroides Ritchie, 1909 S. 



The hydrothecse are smaller than those of the type specimens 

 from the Andaman Islands. The hydranths are decayed, and no 

 gonosome was observed. 



Dimensions : — 



Hydrotheca, depth 0-20 mm. 



,, diameter at mouth 0-15-0-17 mm. 



Localities. Stt. 15 and 16, Ravenshaw Island, Sir John Malcolm 

 Island, and Alligator Rock, 5 to 18 fathoms, rock and sand, or 

 rock and mud ; pare, on Lytocarpv^ phceniceus. 

 [12] 



