HYDR01DS. 103 



The species here figured is one of them ; and, in allusion to 

 its delicate plumes, it is called Plumularia. Along the 

 branches, there are minute cells, each of which was the seat of 

 one of the little Hydra-like animals (in this not a fourth a 

 line long), and usually with short tentacles spread out star-like. 

 Other kinds are simple branching threads, and sometimes the 



MTLLEPORA AliCICORNIS. 



cells are goblet-shaped and terminal. The Tubularise grow in 

 tufts of thread-like tubes, and have a star-shaped flower at top 

 often half an inch in diameter, with a proboscis-like mouth at 

 the centre. In Coryne, a closely-related genus, the tentacles are 

 shorter, and somewhat scattered about the club-shaped or pro- 

 bosciform head of the stem, so that the animal at top is far 

 from star-shaped or graceful in form ; it is in fact a very clum- 

 sy unshapen thing for a Radiate. 



