. TETRAXONIDA 271 Haliclonissa sacciformis, (Plate XLVIII, fig. 10; Fig. 9). Holotype. 28. 2. 15. 621. Occurrence. St. WS 223: Falkland Islands, 11401. Diagnosis. Sponge sacciform, sessile, erect; surface soft to touch, minutely pilose, having an appearance of fine velvet; exhalant apertures opening into a deep central cloaca; tex- ture very soft and compressible; colour, in spirit, yellowish grey; skeleton of stout multispicular primary fibres running vertically to surface, con- nected by diffuse and irregular secondary fibres, with numerous isolated spicules scattered between; spi
. TETRAXONIDA 271 Haliclonissa sacciformis, (Plate XLVIII, fig. 10; Fig. 9). Holotype. 28. 2. 15. 621. Occurrence. St. WS 223: Falkland Islands, 11401. Diagnosis. Sponge sacciform, sessile, erect; surface soft to touch, minutely pilose, having an appearance of fine velvet; exhalant apertures opening into a deep central cloaca; tex- ture very soft and compressible; colour, in spirit, yellowish grey; skeleton of stout multispicular primary fibres running vertically to surface, con- nected by diffuse and irregular secondary fibres, with numerous isolated spicules scattered between; spicules slender oxea measuring 0-32 by 0-007 mm. Remarks. The single specimen is laterally compressed, about 13 cm. high, 9 cm. across and 2-5 cm. wide, with a wide mouth at the apex leading into a deep and capacious cloaca. It re- sembles Chalina spoiigiosissima, Topsent closely in texture, but differs in the external form and the size of the spicules. The primary lines of the skeleton, too, are multispicular instead of bi- or trispicular. Genus Microxina, Topsent Microxina benedeni (Topsent) (Plate L, fig. i; Fig. 10). Gellius benedeni, Topsent, 1901, p. 6; GelUodes benedeni, id., loc. cit., p. 16, pi. ii, fig. 3, pi. iii, fig. 5; Microxina charcoti, Topsent, 1916, p. 170; id., 1917, p. 72, pi. i, fig. 3, pi. ii, fig. 3, pi. vi, fig. 17; GelUodes benedeni, \ fortior, id., 1917, p. 75, pi. ii, fig. i, pi. vi, fig. 22; G. benedeni. Burton, 1929, p. 423; Microxina charcoti, id., loc. cit., p. 423. Occurrence. St. 39: South Georgia, 179-235 in.; St. 149: South Georgia, 200-234 m.; St. 190: Palmer Archipelago, 315 m.; St. WS 81: Falkland Islands, 81-82 m.; St. WS 99: Falkland Islands, 251-225 m.; St. WS 248: Falkland Islands, 210-242 m. Remarks. The British Museum now possesses a considerable number of specimens of GelUodes benedeni and Microxina charcoti, and from these it is clear that the two species are alike in external form and spiculation, except that the first possesses
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