43 



Sample of Newcastle Oysters, being destroyed by steam traffic 

 in the jnver. 



No. 63. These oysters are being destroyed by the large quantity of 

 silt spreading over the natural Oyster-bed ; they only 

 live a few days after being taken from the water, and 

 even when freshly-opened the animal is of a dirty-white 

 colour, and quite unfit for food. 



Cape-Hawke Oysters. 



No. 64. This is the so-called Drift Oyster of the Sydney Oystermen 

 Ostrca subtrigona of Sowerby. 

 An overgrown form of Ostrca glomerata, Gld. 



Lake Cutgee, near Bermagui. 



No. 65. True Mud-Oyster. 



Oslrea edidis, Linn., var. purpurea, Hanley : O. A?igasii, 

 Sowerby. 



Auckland, New Zealand. 



No. 66. Rock-Oyster. 



Ostrea glomcrata, Gld. 



Cape Upstart, Queensland. 

 No. 67. Rock Oyster. 



Ostrca niordax, Gld. Variety of Ostrca glotncraia, Gld. 



No. 68. The True Mud-Oyster. 



Ostrea edulis, Linn., var. O. purpurea (Hanley) ; 



O. Angasii (Sowerby). 

 From Port Jackson. 



No. 69. A variety of the Mud-Oyster ((9. edulis, L.), from the 

 South Coast of Australia, about 130 miles west of 

 Adelaide, near Coffin's Bay ; hard limestone bottom, no 

 mud. 

 This variety produces pearls, but of no commercial value, 

 (Obtained from Messrs. Taylor Brothers, Adelaide.) 



