Fig. 24. — Animals assoeiated with Posidoniei. Oceania, a sea-grass. 

 Threepiecesof leaf are shown. (i4/(er Issel.) A. 1. A Hydroid, 

 Plumularia (Monotheca) obliqiia. 2. An Isopod, Hothea 

 hectica, protectively coloured. 3. A Bryozoon, Membranipora 

 pilosa, and small patches of another, Microporella malusii. B. 



4. A small fish, Lepadogaster bimaculatus, protectively coloured. 



5. Growth of eorallinp, a calcareous Alga. C. 6. Membrani- 

 pora. 7. A Hydroid.Sertularia mediterranea. 



