. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. TETRAXONIDA 269 have here definite evidence of the transition from a chahnoid to a pachychalinoid skeleton in one and the same species. The species is very Hke Haliclona flaccida (Topsent), but this has spicules measuring 0-56 to 0-57 by o-oiy mm. As recorded above, however, there is considerable variation in the size of the spicules of//, bi/amellata, and it is conceivable that the new species and //. flaccida may even yet prove to be identical; and possibly also synonymous with H. dancoi. Ther
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. TETRAXONIDA 269 have here definite evidence of the transition from a chahnoid to a pachychalinoid skeleton in one and the same species. The species is very Hke Haliclona flaccida (Topsent), but this has spicules measuring 0-56 to 0-57 by o-oiy mm. As recorded above, however, there is considerable variation in the size of the spicules of//, bi/amellata, and it is conceivable that the new species and //. flaccida may even yet prove to be identical; and possibly also synonymous with H. dancoi. There are also four specimens, from Sts. WS 27, WS 86 and WS 99, which have oxea measuring 0-35 by 0-009 "^™- ^^^ ^ skeleton, composed of primary lines 8-12 spicules thick and secondary lines 2-4 spicules thick, which gives a more fibrous appearance to the sponge (cf. Plate XLIX, figs. 2, 3). In external form, however, they show the same transitions from tubular to infundibular. One specimen in particular is worth attention, from St. WS 86. This is sub-infundibular, rather like a cup with a cut extending from rim to base (Fig. 6 d). Haliclona stephensi, Holotype. 28. 2. 15. 102. Occurrence. Saldanha Bay (beach). Diagnosis. Sponge thinly encrusting (always ?); surface smooth, even, minutely hispid; texture friable; colour, in spirit, yellow; skeleton an irregular network of single spicules, perhaps quadratic in places, with ill-defined polyspicular bundles usually running towards surface of sponge; oxea slightly curved, abruptly pointed, o-i2 by o-oo6 mm. Remarks. The single specimen, an incrustation several square centimetres in area, on a pebble, appears to agree closely with Reniera sp. from Reit's Bay described by Stephens (1915, p. 464). Haliclona petrosioides, (Fig. 7). Holotype. 28. 2. 15. 434. Occurrence. St. 6: Tristan da Cunha, 80-140 m. Diagnosis. Sponge encrusting to massive and spreading; surface uneven, minutely hispid; texture friable; osc
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