POLYZOAN CORALS 175 



All the specimens show signs of being more or less water- 

 worn, and it is probable, therefore, that they do not live in 

 the spot where they were found but have been carried there 

 from some other locality by the sea currents. When this 

 locality is discovered and complete living specimens have 

 been examined, some of the problems that have arisen from 

 the discovery of these interesting corals will perhaps be 

 solved. 



Haswellia. — The other example was found in a collec- 

 tion of Alcvonaria made by Professor Haddon from shallow 



Fig. 86. — Haswellia. From Torres Straits. A part of a terminal branch. 



X 10 diams. 



water in the Torres Straits. Attached to the Alcyonaria the 

 author found large numbers of a delicate branching coralline 

 Polyzoon belonging to the genus Haswellia (Fig. 86). The 

 most characteristic feature of this genus is that the zooecia 

 are arranged in more or less regular whorls of five or six and 

 are cylindrical in shape, and in the older branches almost 

 completely submerged. The verticillate arrangement is indi- 

 cated by the rings of short collar-like tubes on which the 

 main aperture of the zooecia is mounted. In the specimens 

 from the Torres Straits the largest complete colonies are about 

 two inches in height and the branches are about ^V i'^-ch 

 (i mm.) in diameter. 



