. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 112 PORIFERA. III. 1904. H. raphigeua Tops. Resultats des camp, scient. du Prince de Monaco, Fasc. XXV, 192, PI. XV, fig. 7. (Leptosia). — obtusata Tops, ibid., 193, PI. XV, fig. 6. {Leptosia). — acerata Tops, ibid., 193, PL XV, fig. 5. (Leptosia). 1(p^ _ tcnuissima Dendy, Rep. on the Pearl Oyster Fishery of the Gulf of Manaar, III, 169, PI. XI, fig. 5. (Myxilla). — areolata Thiele, Zool. Jahrb. 1905, 452, Taf. 31, Fig. 23, 68 a—d. 1906. — land/era Tops. Bull, du Mus. d'hist. nat. 560. (Leptosia). The number of species seems
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 112 PORIFERA. III. 1904. H. raphigeua Tops. Resultats des camp, scient. du Prince de Monaco, Fasc. XXV, 192, PI. XV, fig. 7. (Leptosia). — obtusata Tops, ibid., 193, PI. XV, fig. 6. {Leptosia). — acerata Tops, ibid., 193, PL XV, fig. 5. (Leptosia). 1(p^ _ tcnuissima Dendy, Rep. on the Pearl Oyster Fishery of the Gulf of Manaar, III, 169, PI. XI, fig. 5. (Myxilla). — areolata Thiele, Zool. Jahrb. 1905, 452, Taf. 31, Fig. 23, 68 a—d. 1906. — land/era Tops. Bull, du Mus. d'hist. nat. 560. (Leptosia). The number of species seems thus at present to be about seventy; this is already a large number and there is reason to believe, that many more species will be described in the future. Earlier Expeditions paid often but little attention to the insignificant crusts, which is the shape of most Hymedesmia species; it is first in the work of Topsent from 1904 that a greater number of incrusting species of various genera is recorded, and the author says expressly, that this fact is due to the care with which he examined stones, corals etc. brought home. The Ingolf Expedition laid the greatest stress on procuring all small and incrusting sponges, and hence our material is very rich. Under these circumstances when the number of species must be expected to increase in the future to some degree, it is of the greatest importance, that the new species are described thoroughly, and the spicules ought always to be figured, so that the affinities of the species can be judged. I shall therefore try to give here an analytical table of all the above enumerated species; this table is of course only an attempt, and I do not think that a species can be definitely determined only by its aid, but I think however it may be Table of the Species of Hymedesmia. 1. Microsclera present — No microsclera 2. Microsclera only chelse arcuatse (sometimes transformed to spined rods) Microsclera chelse arcuatae together
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