“Isodictya toxophila, sp.n. (Plate LII, figs. 2, 3; Plate LIII, figs. 1, 2; Fig. 18).
Holotype. B.M.28.2.15.158.
Occurrence. St. 39: South Georgia, 179-235 m.; St. 148: South Georgia, 132-148 m.; St. 175: South Shetlands, 200 m.; St. 190: Palmer Archipelago, 93-130 m.; St. WS 27: South Georgia, 106-109 m.
DIAGNOSIS. Sponge irregularly massive, with large oscules, or sub-infundibular with one side oscular, bearing oscules up to 2 mm. diameter, and other side poral, thrown in irregular folds; surface hispid, often verrucose; texture firm, compressible;colour, in spirit, yellow to brown; skeleton sub-isodictyal, with primary fibres 12-20 spicules thick, secondary fibres loose or represented by irregularly scattered single spicules; oxea 0.42 by 0.02 mm.; chelae 0.06 mm. chord; toxa up to 0.175 mm. long.
REMARKS. The species, which is characterized mainly by the possession of toxa in addition to isochelae, shows a similar range in external form to that found in Haliclona bilamellata (see p. 267). The microscleres are very variable in their occurrence, the toxa are often very rare, and in one specimen no microscleres at all could be found.”
(Burton, 1932)
