. Fig. 6. Bryozoa (coral patches) (fig. 6). When an adult Barnacle falls off the hull it generally leaves behind a circular patch or base plate. This may resemble a coral patch. The base plate of the Barnacle is marked by lines, whereas the coral patch is distinctly granular in appearance. The flat encrusting type of Bryozoa is freq^uently hard and calcareous, whereas the branching type is generally soft and flexible. 16

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