HALF AN HOUR WITH CORALLINES. 



101 



Fig. 54. 



the capsules being similar in both species. In the 

 latter they have two spines at the upper end, and a 

 prominent mouth. Yet another species of " sea-fir " 

 is 8. rugosa, which is usually found parasitic on the 

 fronds of the sea-mat, as well as on seaweeds. 



There are many other kinds 

 of zoophytes which the ob- 

 serving eyes of our readers 

 may detect. Of these, perhaps 

 the Campanularidse are the 

 prettiest, with their slender 

 stalks terminating in crystal 

 bells, so as to richly deserve 

 the name they have borrowed 

 from the well-known flower. 

 In the species grouped under 

 this division, the cells are 

 stalked, a distinction between 

 them and the sertularians, in 

 which no such arrangement 

 exists. Their reproduction is by budding, the 

 medusoid, glassy buds being free-swimming, 

 and producing ova and germ cells, as in others 

 of the hydrozoa. The Campanularidte are very 

 small, and usually parasitic on the fronds and 

 stems of seaweeds, to which they cling like so many 

 delicate hairs. Another peculiar zoophyte is the 

 " Bird's-head Coralline " (Cellularia avieularis). It 

 is a delicate, feathery object, greatly resembling 

 some of the finer seaweeds, and is two or three 



