90 



HALF AN HOUR WITH CORALLINES. 



found adhering to rocks and shells by means of little 

 wrinkled tubes, from which it rises into erect stems. 

 These are surrounded from bottom to top with pin- 

 nated branches, the smaller of which have little 

 cells on the side and bend inwards. A magnified 



Fig. 38. Fig. 39. 



Thuiaria thuia, magnified. 

 6. capsule. 



Sickle Coralline. 



view of these side cells is given in Fig. 40, where 

 the reader will see their crowded arrangement. 

 The capsules seen in Fig. 41 are pear-shaped, slightly 

 ribbed when dry, and having a contracted tubular 

 mouth. These are most abundant hi the spring. 



Sertularia abietina is a coralline even more abun- 

 dant than the last-named. It is this species which 

 the reader must have noticed growing in little groves 

 on the surfaces of old oyster shells, and its specific 



