564 THE GREAT BARRIER REEF. 



CHROMO PLATE XIV. 

 GREAT BARRIER REEF OYSTERS. 



Figs. I and 2. — Coral Rock Oyster, Ostrea mordax (Fig. 2 represents var. cucttllata), p. 246. Lateral 

 and horizontal view.s ; natural size. 



Figs. 3 and 4. — Trap-door Oysters, Ostrea inorda.x, var. coniitcopuvformis, p. 248. Fig. 3, Lateral 

 view; Fig. 4, Dorsal view, with opercular valve removed, showing elongated hinge scar; 

 natural size. 



Fig. 5. — Cockscomb Oyster, Ostrea crista-galli, p. 244. Lateral view of small specimen; natural 

 size. 



Fig. 6. — Saddle Oyster, Ostrea sellaforiiiis, n.sp., p. 250. Lateral view; natural size. 



Fig. 7. — Black-edged Oyster, Ostrea nigro-marginata, pp. 1 17 and 245. Single valve; natural size. 



Figs. 8 and 1 1. — Commercial " Rock " Oj'ster, Ostrea glomerata, p. 250. 8, Ordinary bunch, natural 

 size, showing at a. hole bored by predatory whelk, Urosalpiux pavia ; g, Vegetarian whelk, 

 Potamides eberninus, with attached brood of young rock oysters ; 10, Spinous variety of young 

 condition ; 11, Ordinary brood and spat. 



Fig. 12. — Pea-Crab, Pinnotheres sp., p. 214, which lives as a commensal within mantle-folds of 

 mother-of-pearl shell, Meleagrina margaritifera ; natural size. 



Fig. 13. — ^Crustacean, Alphens avarus, p. 214, which also lives as a commensal within the mantle- 

 folds of the Torres Strait mother-of-pearl shell. 



