This table shows all vessels of the class which were carried on the books of the Royal Navy in the period 1840-1880. The total number of vessels in the class may have been higher (vessels disposed of before 1840 or acquired after 1880).
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|Cyclops||1871.07.18||1903||I||S||Coast defence monitor||3480||4||115|
|Hecate||1871.09.30||1903||I||S||Coast defence monitor||3480||4|
|Gorgon||1871.10.14||1903||I||S||Coast defence monitor||3560||4||203|
|Hydra||1871.12.28||1903||I||S||Coast defence monitor||3480||4||244|