Cladodactyla planci Brandt, 1835 – synonym of Ocnus planci
Comatula celtica McAndrew and Barrett, 1858 – synonym of Leptometra celtica
Comatula woodwardi Barrett, 1857, non Forbes , 1852 – synonym of Leptometra celtica
Cribella rosea Forbes, 1852 – synonym of Stichastrella rosea
Cribrella oculata (Pennant) Forbes, 1841 – synonym of Henricia sanguinolenta
Cribrella pectinataVerrill, 1894 – synonym of Henricia sanguinolenta
Cribrella sanguinolenta forma laevior Michailovskij, 1902 – synonym of Henricia sanguinolenta
Cribrella sanguinolenta var. curta Norman, 1869 – synonym of Henricia sanguinolenta
Cucumaria assimilis Düben & Koren, 1846 – synonym of Cucumaria frondosa
Cucumaria communis Forbes, 1841 – synonym of Thyonidium drummondii
Cucumaria doliolum Lamk., partim., 18?? – synonym of Ocnus planci
Cucumaria elongata Düben and Koren, 1846 – synonym of Leptopentacta elongata
Cucumaria fusiformis Forbes and Goodsir, 1839 – synonym of Leptopentacta elongata
Cucumaria hyndmani W. Thompson, 1840 – synonym of Paracucumaria hyndmani
Cucumaria mosterensis Grieg, 1889 – synonym of Ocnus lacteus
Cucumaria nobilis Ludwig, 1874 – synonym of Thyonidium drummondii
Cucumaria pentactes Forbes, 184?1 – synonym of Leptopentacta elongata
Cucumaria perspicua Ludwig, 1874 – synonym of Thyonidium drummondii
Cucumaria planci von Marenzeller, 1893 – synonym of Ocnus planci