ZOOPHYTES. 161 



The life-history of the zoophytes is extremely interesting, 

 and the student will scarcely be able to appreciate that the 

 ovoid ciliated mass, seen escaping from the ova of the parent, 

 would ever lose its cilia and develop into the parental 

 form. 



FIG. 147. 



When it is desired to keep them for preservation and 

 mounting, the same method may be employed as for 

 Polyzoa, to drop alcohol into the water in which they have 

 been collected, which is stated to kill them while causing 

 but little retraction of the tentacles. 



Books which may be consulted: 'The Micrographic Dic- 

 tionary'; Johnstone's 'British Zoophytes'; Hincks' 'British 

 Hydroid Zoophytes/ 



M 



