i C. HEDLEY. 



Plate III, Fig. 5. 

 A rock shelf at low spring tide near Port Hacking Point. In 

 the foreground tufts of Sea Cabbage, Viva lactuca, Linn., inter- 

 spersed with small pools. In the distance a breaking ocean roller. 



Plate III, Fig. 6. 



An ocean reef beach at the entrance of Long Bay at low spring 

 tide, showing the coralline weed, Corallina chilensis, Decaisne, 

 exposed in the foreground. The rocks at the back, which are 

 covered at high tide, are over-grown by limpets and barnacles. 



Plate IV, Fig. 7. 



Another ocean-reef beach scene at low spring tide, from Port 

 Hacking Point. In the foreground, a colony of Cynthia prcepu- 

 tialis, Heller, a dominant form in the surf horizon. On the left, 

 a few stragglers grow apart, but on the right, the ascidians are 

 compacted into a continuous mass. The rock above is thickly 

 studded with barnacles, conspicuous among which are Balanus 

 nigresens, Tetraclita rosea, Catophragmus polymerus, and the 

 mollusc Siphonaria virgulata. The whole range of the tide is 

 here exposed. 



Plate IV, Fig. 8. 



From Sugar Loaf Bay, Middle Harbour, the tide is here about 

 a quarter flood. A streak of oysters (0. cucullata, Born.) a 

 dominant form on estuarine rocks, plasters the rock -wall extending 

 at a uniform level from the foreground to beyond the boat. They 

 cluster, not only on the rock but on each other; in the immediate 

 foreground, the uppermost tier have lost their lid or upper valve, 

 and the empty lower valve is left adherent to the wall. Below the 

 oysters, the usual underlining of mussels, Brachyodontes hirsutus, is 

 concealed under water. 



Plate V, Fig. 9. 

 A rock reef at Wyargine Point, Middle Harbour, within reach 

 of the ocean waves, seen at low neap tide. No stone is visible, 

 though pools and fissures shadow the main features of the rocks 



