LIST OF FIGURES IN TEXT. 



Fig. I. — Lithodomiis^ a boring bivalved mollusc, 



which attacks the shell of the Pearl-oyster. . . page 85 



Figs. 2, 3 & 4. — Sections of shell of Pearl- 

 oyster, shewing how a Pearl, or other object, 

 may become buried in the substance of the 

 shell, and ultimately disappear ... ... „ 96 



Figs. 5, 6 and 7. — Sections of shell of Pearl- 

 oyster, shewing the thickening of the internal 

 surface, by deposition of nacre, opposite to 

 the point of attack of a boring mollusc, such 

 as the Ltt/iodomus^ which is piercing the shell 

 from without „ 97 



Fig. 8. — Split-shell of Pearl-oyster, 

 disclosing Pearls embedded in the substance 

 of the shell ... ... ... ... ... „ 118 



Fig. 9. — Dredge, or Bajak, used in Pearling 



in the Sooloo Archipelago » 140 



Fig. 10. — Parti-Coloured Pearl, half black and 



half white, from Koepang ,,266 



Fig. II.— The Great Southern Cross Pearl, 

 from Western Australia, as exhibited in the 

 Colonial and Indian Exhibition, 1886 ... „ 301 



