Plate 43
The vertical 100 µm scale bar applies to figures 1-5a;
figs. 5b, 6 and 7 each have their own scale bar.
Figs. 1, 6. Dictyocoryne absyssorum. Fig. 1 with damaged patagium (presumably due to dissolution); in fig. 6 it has not yet developed. Note terminal spines on arms in fig. 6. See also Pl. 44 figs. 3-5, 8. BSS 28B(II) (2x).
Figs. 2-5, 7. Dictyocoryne truncatum. Morphological variation includes the length and width of the arms (compare figs. 1 and 3 to the others), various degrees of patagial development (fig. 4 and especially 5 having the most complete ones; fig. 5b illustrates the delicate by-spines arising from the surface of the patagium), and presence and length of terminal spines (figs. 1-3: none, fig. 4: short spines, fig. 5 3-4 well developed ones per arm). Figs. 3 and 5a,b: forma echinata; fig. 7 is a cross-section of the central structure (the specimen was broken manually), showing a dense, compact arrangement of the successive concentric layers, a structure similar to that of the arms. BSS 28B(II); (no sample ID); BSS 28B(II); BSS 28B(II/624) and BSS 28B(a). |
