Dysidea, , Johnston.

Gunther, Albert C. L. G., Dallas, William S., Carruthers, William & Francis, William, 1885, The Annals and Magazine of Natural History, Including Zoology, Botany, and Geology, Reptiles and Batrachians from Brazil, LONGMANS, GREEN, AND CO.; SIMPKIN, MARSHALL, AND CO.; KENT AND CO.,; WHITT AKER AND CO.: BAILLIERE, PARIS: MACLACHLAN AND STEWART, EDINBURGH: HODGES, FOSTER, AND CO., DUBLIN: AND ASHER, BERLIN: TAYLOR AND FRANCIS, pp. 1-96 : 215

Gen. DYSIDEA, Johnston.

Char, emend. Fibrous arenaceous sponges, in which the fibre is chiefly composed of foreign microscopic objects (sand, fragmentary sponge-spicules, &c.), held together by a mere film of keratine, supporting the flakes of the parenchymatous sarcode; traversed by the branches of the excretory canal ­ system; assuming a variety of sponge-like forms, on which the pore-dermis may be continuous and smooth, or rendered more or less uneven and rough by projection of the subjacent fibre, according to the species.