PROCEEDINGS OF SECTION C. • 401 



RESUME OF ZONES (E. HOPE ISLE)— continued. 



2. Ps3udo-lagooii — (a) Sponges 100yds. 



(6) Mussels, &c 300yds. 



(c) Heliopora 500yds. 



3. Clinker embankment 10yds. 



4. Rock pools 30yds. 



5: Outer zone, massive living corals 10ft. 



II. (b) TRAVERSE ACROSS CAIRNS REEF. 

 This reef lies to the east of Hope Island, and about 10 miles from 

 the Queensland coast (see Plate II.). It has much the same shape 

 as the East Hope Reef— i.e., the form of a horseshoe, with the convexity 

 to the south — but has ten times the extent and is wholl}^ covered at 

 high tide. At low water the main (west) arm of the horseshoe is ex- 

 posed as an area 10 miles long and one mile wide. Standing on the 

 inner edge and looking outwards, it has all the appearance of a huge 

 sandy waste with a few scattered tussocks here and there. On the 

 farther edge the jagged or rounded " negroheads " seem to lie at a higher 

 elevation than is actually the case owing to refraction, while the white 

 line of surf appears on the point of rushing over the " barrens " between. 



RESUME^ OF ZONES, COHIMENCING AT NORTE. 

 1. Rampart of live coral fringing the ragged edge of 



the reef 10ft. 



' 2. Zone of corals of less robust nature 30ft. 



3. Alcyonaria zone (colonies more isolated than on Hope 



Island) 100yds. 



4. Sandy lagoon, with scattered green Astreid coral 



colonies of size and shape of a cricket ball 200yds. 



5. Pure fine coral sand (no organisms) 50yds. 



6. Sand, with isolated frondose Alcyonaria, also few 



Euspongia (12in. diam.) 250yds. 



7. Sand, with Halimeda growing fairly thickly, few 



Tridacna and Zostera 200yd«. 



8. Shallow sandy lagf^on, with Pinna, Zostera and "net" 



algae {Hydroclathrus) 200yds. 



9. Bare coarse sand, with molluscs 250yds. 



10. Single isolated Negrohead, 5tt. high, oyster covered, 



followed by strong Chama beds 100yds. 



11. Rough coral slabs, with much live Orhitolites, dwarf 



Porites growing on lee side 300yds. 



12. Negroheads fairly iiumerous, coral slabs and rocky 



pools ; isolated Porites and green Astreids, also 

 Orhitolites 350yds. 



13. Loose d&ad corals in angular and cylindrical frag- 



ments, larger Astreids on lee of big boulders 503-ds. 



14. Live coral zone covered by surf and reaching to 



rampart 20ft. 



c2 



