Abstract
The shell strengths of seven species of barnacle were investigated by carrying out a series of compression and tension experiments. All species were tested under compression as solitary individuals. In addition the shell strength of crowdedSemibalanus balanoideswas determined. Results of the compression experiments showBalanus balanusandB. perforatusto be the strongest species withVerruca stroemiathe weakest. All species were much weaker in tension than compression, particularly those with a calcified base,B. balanusbeing the weakest of the five species tested in this way.The possibility of adaptive design of the barnacle shell to withstand wave action and predation techniques is discussed in the light of the results from the compression and tension experiments. Finally the importance of carrying out a wide range of tests of the shells when trying to determine their strength is discussed.
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