THE LOWER FORMS OF LIFE. 



81 



Fig. 103. Thoahalecina (magnified) ; common on shells and stones in deep water; herring- 

 bone coralline ; polyps yellow. 



Fig. 104. Sertularia polyzonias (magnified) ; on shells and other Zoophytes in deep water 

 polyps white, sometimes bright yellow. 



Fig. 105. Thuiaria thuia (young), magnified; on shells in deep water. 



Fig. 106. The same (mature) ; called by the fishermen of Scarborough the "Bottle-brush 

 Coralline ;" polyps white. 



called the " Herring-bone Coralline." It is found on shells and 

 rocks, below the low-water tide mark. There are two other species 



G 



