. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. PORIFERA. II. 209 structure as the chelse of the grown sponge, but reach at most a length of 0"025mm. The specimens in question were obtained in the beginning of June. Locality: Station 57, 630 37' Lat. N., 130 02'Long. W., depth 350 fathoms; station 73, 62° 58'Lat. N., 230 28' Long. W., depth 486 fathoms. Both stations are situated south of Iceland. F. groenlandica Frstdt. PI. XX, Fig. 3 a—e. 1887. Forcepia groenlandica Fristedt, Vega Exp. vetensk. Iakttag. IV, 452, PI. 25, figs. 40—46. 1904. ? Trachyforcepia groenland
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. PORIFERA. II. 209 structure as the chelse of the grown sponge, but reach at most a length of 0"025mm. The specimens in question were obtained in the beginning of June. Locality: Station 57, 630 37' Lat. N., 130 02'Long. W., depth 350 fathoms; station 73, 62° 58'Lat. N., 230 28' Long. W., depth 486 fathoms. Both stations are situated south of Iceland. F. groenlandica Frstdt. PI. XX, Fig. 3 a—e. 1887. Forcepia groenlandica Fristedt, Vega Exp. vetensk. Iakttag. IV, 452, PI. 25, figs. 40—46. 1904. ? Trachyforcepia groenlandica Topsent, Resultats des camp, scient. du Prince de Monaco Fasc. XXV, 181, PI. XV, fig. 14. Thickly incrusting or massive. Spicula: Megasclera: the skeletal spicules acanthostyli 0-42— °'55"""> M'c dermal spicules tylota 0-40—0-447"'"'; niicrosclera of three forms, isochela; arcuatce 0-023— O'ojj""", forcipes o-ojj—0-0529""", sigmata, more or less contort, 0-114—0-15""". This species has not been obtained by the Ingolf-Expedition, and I have only before me a small fragment of the type specimen; therefore I only mention the spicules more particularly, a. Mega- sclera. 1. The skeletal spicules are acanthostyli; they are slightly curved, either evenly through their whole length, or with the curve nearer to the upper end. The point is rather short, at most middle long. The spinulation is rather scattered, but in this feature some variation may be found; the spines continue out on the very point; at the head-end they are generally more closely gathered. The length of the acanthostyli is 0-42—o-55mm, and the thickness o-on—o-oi4ram. 2. The dermal spicules are slender, straight tylota with slightly swollen ends; their length is 0-40—o-447mm, the thickness is ca. o-oo7ram. b. Microsclera ; these are of three forms, isochelse arcuatse, forcipes, and sig- mata. 1. Chelse arcuatse are of a sim
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