Ridley, S.O.; Duncan, P.M. (1881). On the Genus Plocamia, Schmidt, and on some other Sponges of the Order Echinonemata. With Descriptions of two additional new Species of Dirrhopalum. Journal of the Linnean Society. Zoology. 15 (88): 476-497, pls 28-29.
8097
Ridley, S.O.; Duncan, P.M.
1881
On the Genus <i>Plocamia</i>, Schmidt, and on some other Sponges of the Order Echinonemata. With Descriptions of two additional new Species of <i>Dirrhopalum</i>.
