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Jørgensen 1905

Plate 10

Fig. 38. Rhizoplegma boreale (CL.) Jørg., 450/1.
e. Young specimen with 7 main spines. Diameter of the inner shell 28-30 µ. Sea 40 miles NW of Gaukværø, 19/1 1899, 0-700 m.
f. Young specimen, divergent form with 11 main spines. Henningsvær, 17/1 1899, 0-180 m.

Fig. 39. Stylodictya tenuispina JØRG. n. sp., 450/1. Sea off Røst, 22/3 1899, 0-900 m.
a. In the figure the inner rings are seen, and the connecting inner radial beams which are, however, only shown on the space between the two outer rings. The coarse pores on the median part of the shell and some of the pores on the other portion are also depicted.
b. The same specimen, optical section, showing the rings and radial beams.
c. The same in side view, optical section. In the middle the rounded higher portion is seen. Punctiform byspines on both sides.

Fig. 40. Stylodictya validispina JØRG. n. sp., 450/1. Sea off Røst, 22/3 1899, 0-900 m.
a. Optical section, showing the system of rings and the radial spines. The pores on the outside are shown on a portion of the valve.
b. The same spcimen in side view; optical section.

Fig. 41. Stylodictya aculeata JØRG. n. sp., 450/1. Sea off Røst, 22/3 1899, 0-900 m.
a. The disc from above, with pores and radial spines. The small dark puncta on the surface are the byspines. The inner rings are suggested.
b. The same specimen; optical section
c. The same in side view; optical section.

Fig. 42. Phorticium pylonium (HCK.?) CL., 450/1. The Tys Fiord, 28/3 1899, 0-700 m.
*. Schematical figure, dorsal view, showing in perspective the 3 girdles, perpendicular to each other. The figure shows only one of these systems of girdles; in reality there are 3 of them. L = the lateral girdle, seen from the (narrow) side; T = the transverse girdle, S = the sagittal one. In the middle of the latter an inner lateral girdle is developed, parallel to the outer on (is not seen in the figure), in the middle of this inner lateral girdle, an inner transverse one, a. s. o. For the sake of clearness, the girdles are depicted narrow, and distinctly compressed.
a. Dorsal view, showing the pores and the outer spines (main- and byspines).
b. The same specimen, same view, optical section (lateral section). To the right and left the outer lateral girdle is seen, and parallel to this two inner ones.
c. Same specimen, apical view. When the figure is seen from the side, where the number (42 c) is printed, it answers to the fig. a, seen from above.
d. Same specimen, same view; optical section (= transverse one). The transverse girdle goes around the figure, and is seen from the (narrow) side. Across this girdle the outer sagittal one is seen, and in the inner, the second and third transverse ones.