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Cobra or Shipworms Tom Iredale
Comparison with Results of Investigations in Waters North of Port Jackson
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attack established attack not noticeably attack still medium boring pests Brisbane River Brisbane waters Brush Box Bryozoa calcareous worm tubes Chelura attack Circular Quay Cobra attack combined Cobra combined Limnoria Cove Crustacean mud tubes Darling Harbour destruction of sample Ferry Jetty figured specimen Graph growth light Barnacles growth lines growth medium Barnacles growth very light heavy Barnacles heavy stage Hedley Hinge area Hydrozoa intensity of attack Iredale Fig Lane Cove River length light stage Limnoria and Chelura Limnoria attack advanced Limnoria attack noticeable Measurements—Shell Middle Harbour Middle median Mussels Nausitora noticeable advance oi oi oi oiip oregon control piece Oyster Cove pallet Parramatta River piles pill-bugs Port Jackson Station Posterior auricle puoXaq Pyrmont ridge rosenthali salinity sample destroyed Sample set sculptured set in position Shipworms species Spharoma attack Sphceroma quoyana sqiuom stalk Suuip Teredo austini test pieces timber Tristania turpentine Type specimen umbones unchanged during previous Walsh Bay Wharf