. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. PORIFERA. II. 45 1887. Cladorhiza Nordenskioldii Fristedt, Vega-Exp. vetensk. Iaktt. IV, 455, PI. 25, figs. 56—59, PI. 31, fig- 25. 1896. Cladorhiza Nordenskioldii Lambe, Proceed, of the Roy. Soc. of Canada, Ser. 2, II, Sect. IV, 189, PL I, figs. 9, 9 a—f. 1901. Asbcstopliuna pennatula Topsent, Resultats du Vovage dn S. Y. Belgica, Spongiaires, 24 et 28, PL III, fig. 9 a— d. 1903. Cladorhiza pennatula Thiele, Archiv fur Naturgeseh. 1903, 385. 1903. Esperella plumosa Arnesen, Bergens Museums Aarb. 1903, No. 1, 11, Taf. II, Fi
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. PORIFERA. II. 45 1887. Cladorhiza Nordenskioldii Fristedt, Vega-Exp. vetensk. Iaktt. IV, 455, PI. 25, figs. 56—59, PI. 31, fig- 25. 1896. Cladorhiza Nordenskioldii Lambe, Proceed, of the Roy. Soc. of Canada, Ser. 2, II, Sect. IV, 189, PL I, figs. 9, 9 a—f. 1901. Asbcstopliuna pennatula Topsent, Resultats du Vovage dn S. Y. Belgica, Spongiaires, 24 et 28, PL III, fig. 9 a— d. 1903. Cladorhiza pennatula Thiele, Archiv fur Naturgeseh. 1903, 385. 1903. Esperella plumosa Arnesen, Bergens Museums Aarb. 1903, No. 1, 11, Taf. II, Fig. 1, Taf. IV, Fig. 3, Taf. VI, Fig. 7. Slender, penniform; the axis a little eompressed and the more or less long lateral branches in- serted in flie narrow sides. The axial skeleton with a rather powerful, close-spiculed exterior layer. Spienla: Megasclera styli in the axis o-68—i""", subtylostyli in the brandies and in the outer layer of the axis 0-52—o^j""", irregitlarly sinuous, minutely spinulous tylostrongyla in the eoating of the stalk 0-05—o-ij/""": mierosclera of three for vis, anisochelce palmata of two forms, the characteristic ones o-o/o—0-0114""". the large ones with the lower end polylobate 0-048—o-o6j""", sigmata 0-021—0-024""". By the description of Schmidt cited above this species would not be recognizable; the recog- nition has only been possible by the description and figures of Topsent The species is erect and more or less penniform. It consists of an axis carrying for some way above a row of rather short lateral branches on either side. At the base the axis is somewhat thickened. All the specimens in hand are broken off below, but judging from the best preserved specimens and from stalk-fragments that must be of the lower part of the stalk, the stalk is here provided with more or less numerous, rather short lateral processes placed irregularly s
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