. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. PORIFERA. III. IOI longest being often thin; the small styli have a length of 0-119—o-i6mm and a diameter at the head of o-02imm. The large styli are generally in size nearest the greatest length, the shorter of them, which are nearly intermediate between the large and the small, being rare. 2. The dermal spicules are long and straight strongyla, sometimes one end, and sometimes both may be slightly swollen, in the latter case the spicule approaching to a tylote; they are as a rule slightly polytylote. The length is 0-32—0-4
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. PORIFERA. III. IOI longest being often thin; the small styli have a length of 0-119—o-i6mm and a diameter at the head of o-02imm. The large styli are generally in size nearest the greatest length, the shorter of them, which are nearly intermediate between the large and the small, being rare. 2. The dermal spicules are long and straight strongyla, sometimes one end, and sometimes both may be slightly swollen, in the latter case the spicule approaching to a tylote; they are as a rule slightly polytylote. The length is 0-32—0-42mm and the diameter 0-005—0-007mm. Some fine developmental stages were found which were monactinal. b. Microsclera are of one form, sigmata, which are rather curious; they are large but exceedingly thin, and they are more or less contorted up to a quarter of a turn, otherwise they are of the common shape. The length is 0-084—°'12 mm ar>d the thickness o-ooi4mm. The sigmata occur through the whole tissue but are especially numerous at the surface. Locality: Station 9, 640 18'Lat. N., 270 00'Long. W., depth 295 fathoms; station 98, 65° 38'Lat. N., 260 27' Long. W., depth 138 fathoms. Both localities lie in the Denmark Strait. 45. H. Dujardinii Bow. PL X, Fig. 5. 1866. Hymeniacidon Dujardinii Bowerbank, Mon. Brit. Spong. II, 224, 38. 1867. Halisarca Dujardinii, Gray, Proc. Zool. Soc. 1867, 520. 1874. Hymeniacidon Dujardinii Bowerbank, 1. c. Ill, 95. PL XXXVIII, figs. 1—4. 1882. Bowerbank, Norman, ibid. IV, 92, 48. 1888. Dendoryx Dujardini, Topsent, Arch, de Zool. exp. et gen. 2, V bis, 115, PL VI, fig. 3, 12, 13 c. 1890. — — , Topsent, Mem. de la Soc. Zool. de Fr. Ill, 201. 1891. — — , Topsent, Arch, de Zool. exp. et gen. 2, IX, 528. 1892. , Topsent, Resultats des camp, scient. du Prince de Monaco, Fasc. II, 99. 1892. Myxilla radiata Bow. Topsent, (partim, the last passage), ibid. 109. 1894. Leptosia Dujardini, Topsent, Mem. de la Soc. Zool. de Fr., VII, yj
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