. Echinoidea of the Swedish South Polar Expedition . Fig- 5- Transverse section of radiole of Austrocidaris canalhulata. 6s,'i. The secondary spines are generally appressed; those round the radioles are the longest, ca. 3 mm., the primary ambulacral spines are a little shorter; the miliary spines are scarcely half the length of the primary ones. The spines on the apical system are very short, only those surrounding the anal opening are somewhat longer. The smaller spines are cylindrical, the larger ones, especially those round the radioles, are distinctly flattened and rather broad, not pointe
. Echinoidea of the Swedish South Polar Expedition . Fig- 5- Transverse section of radiole of Austrocidaris canalhulata. 6s,'i. The secondary spines are generally appressed; those round the radioles are the longest, ca. 3 mm., the primary ambulacral spines are a little shorter; the miliary spines are scarcely half the length of the primary ones. The spines on the apical system are very short, only those surrounding the anal opening are somewhat longer. The smaller spines are cylindrical, the larger ones, especially those round the radioles, are distinctly flattened and rather broad, not pointed. They are very smooth. The pedicellariae are rather inconspicuous and not very numerous. The large globiferous pedicellariae are typically of the form shown in PI. VIII Fig. 32 of the »Ingolf»-Echinoidea I; but they may vary not inconsiderably. The side-edges do not always proceed as far as the terminal opening, but may end at a shorter or longer distance below; but they may also pass almost to the very point of the valve, the opening thus lying within the blade, and in this case the opening may be somewhat smaller than usual. On the other hand it must be noticed that a form recalling that of the large globiferous pedicellariae of Austrocidaris Lorio/i, figured in the »Ingolfj>-Ech. I. p. 170 Fig. 7, was never met with in any of the specimens examined
Size: 2591px × 1929px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1910
