92 



HALF AN HOUR WITH CORALLINES. 



Fig. 42. 



upwards. The capsules are ovate, with a short 

 mouth, and smooth or slightly wrinkled across when 



dry. The u Lily 

 Coralline ' ' (Sertu- 

 laria rosacea, Fig. 

 44) usually occurs 

 as a parasite on 

 other zoophytes. 

 Eecently this 

 species has had 

 transferred to it 

 the generic name 

 of Diphasia, and 

 this genus includes 

 six other species. 

 The difference is 

 based on the pre- 

 sence of a spherical 

 pouch in the upper 

 portion of the cap- 

 sule, which is ab- 

 sent in the true 

 sertularians. This 

 species is the small- 

 est, in size, of the 

 group. Indeed, it 

 is one of the most 

 delicate of all this 

 , class of zoophytes, 



Ser tutor ia abietma. a. calycles ; 6. capsule, * 



magnified. the shoots being 



The Sea Fir. 



Fig. 43. 



