Ascidia incerta Herdman, 1898 accepted as Ascidia sydneiensis Stimpson, 1855 (original description)
Colella cyanea Herdman, 1898 accepted as Sigillina cyanea (Herdman, 1899) (original description)
Cynthia cataphracta Herdman, 1898 accepted as Pyura spinosa (Quoy & Gaimard, 1834) (original description)
Cynthia molguloides Herdman, 1898 accepted as Pyura molguloides (Herdman, 1899) (original description)
Molgula recumbens Herdman, 1899 (original description)
Polycarpa sacciformis Herdman, 1899 (original description)
Polycarpa sluiteri Herdman, 1898 accepted as Polycarpa rigida Herdman, 1881 (original description)
Polycarpa stephenensis Herdman, 1899 (original description)
Polyclinum clava Herdman, 1899 (original description)
Polyclinum fuscum Herdman, 1899 (original description)
Polyclinum prunum Herdman, 1898 accepted as Synoicum prunum (Herdman, 1899) (original description)
Psammaplidium lobatum Herdman, 1891 accepted as Aplidium solidum (Ritter & Forsyth, 1917) (original description)
Styela etheridgii Herdman, 1898 accepted as Cnemidocarpa radicosa (Herdman, 1882) (original description)
Styela personata Herdman, 1898 accepted as Cnemidocarpa personata (Herdman, 1899) (original description)
Styela pinguis Herdman, 1898 accepted as Styela plicata (Lesueur, 1823) (original description)
Styela stolonifera Herdman, 1898 accepted as Cnemidocarpa stolonifera (Herdman, 1899) (original description)