G. CELLEPORA. 41 



RADIATED. 



16. Cellepora radiata. Cells sub-oval, almost 

 radiated, granulated, and nearly convex ; openings 

 half orbicular, bordered with from four to six teeth. 



Mediterranean. 



FRINGED. 



17. Cellepora ciliata. Cells convex, with the 

 opening usually divided into seven spines. 



On the European fucus. 



SIXTEEN-TOOTHED. 



18. Cellepora sedecim-dentata. Openings of the 

 cells oval, and longitudinally oblique, with sixteen 

 teeth on the border. 



Mediterranean. 



TWO-POINTED. 



19. Cellepora bimucronata. Cells oblong and 

 nearly oval ; surface rough, with points situated in 

 transverse lines ; openings nearly orbicular, with two 

 opposite teeth. 



Mediterranean. 



COMMON. 



20. Cellepora vulgaris. Cells oval, convex, and 

 alternate ; openings half orbicular ; lower lip slit, with 

 two holes underneath. 



Mediterranean. 



ROUND-MOUTH. 



21. Cellepora cyclostoma. Cells oval, alternate, 

 and slightly punctured ; openings round and entire. 



Mediterranean. 



Cor, p 



