Fig. 27. Achnanthes tæniata GRUN.; 950/1. Sea of Kara, bottom mud from a depth of 36 fathoms (Swedish Expedition to Jenissey 1875; sample from the Riksmusæum, Stockholm).
a. Part of a long chain, ignited on cover-glass (dry preparation). Breadth 24 µ.
b. Part of another chain, in styrax. Here it is more distinctly seen that only one valve is provided with a central nodule.
Fig. 28. Achnanthes hyperborea GRUN. Barent's Sea, 31/5 1900.
a. Lower valve; 950/1. In the middle part more distant and conspicuous striæ, the others, towards the ends, rather indistinct. Dry preparation. The valve appeared distinctly convex. Length 28 µ.
b. Lower valve, from the inner side; 950/1. 28 µ x 6 µ.
c. Part of a chain of the same species (?), ignited on cover-glass; 660/1. Length of the valve 30 µ.
Fig. 29. Peridinium pedunculatum SCHÜTT, 450/1. The Oster Fiord near Bergen, 1901.
a and d. Ventral view.
b and c. The same specimen, dorsal view.
e. The same, seen from the right side.
Fig. 30. Hexacontium enthacanthum, JØRG., 450/1. Sea northwest of Vesteraalen, 23/2 1901, 0 m (S/S Michael Sars).
a. Second shell with two radial spines and a portion of the outer shell. Only 2 byspines are figured.
b. The inmost shell.
Fig. 31. Hexacontium pachydermum JØRG., 450/1.
a. The Herlø Fiord (near Bergen), 12/8 1898. Only some of the byspines of the outer shell are figured.
b. Henningsvær, 6/3 1899.
Fig. 32. Hexacontium; young specimen, as yet with only two shells; 450/1. From the same locality as fig. 30.
a. Second shell with 4, as yet only thin, radial spines.
b. The same specimen in optical section, showing the two shells.
Fig. 33. Echinomma leptodermum JØRG., 450/1
a. Kvænangen I, 24/1 1899, 0-140 m.
b. Sea off Røst, 22/3 1899. The outer shell is partly removed.
c. Hellingsvær, 12/1 1899, 0-250 m, without outer shell. The 3rd shell is indicated by transverse processus on the radial spines.
Fig. 34. Drymyomma elegans JØRG., 450/1. Skroven, 4/2 1899 0-300 m.
a. Outer shell with main? and byspines.
b. The same specimen in optical section, showing the 3 shells.
Fig. 35. Chromyechinus borealis (CL.), 450/1. The Tys Fiord, 28/3 1899, 0-700 m.
a. The 3rd shell with main? and byspines. Around it the very delicate outer shell is seen (only incompletely illustrated). Also the shell next to the inmost one is indicated in the figure; it is more distinctly seen through a large (accidental) irregular hole in the 3rd shell.
b. The same specimen. Optical section, showing the 4 shells.