Echinoidea of the Swedish South Polar Expedition echinoideaofswed00mort Year: 1910 io TIL MORTENSEN, (Schwed. Siidpolar-Exp. Also the pedicellariae afford some differences. In the specimen from St. 17 they are invested by an unusually thick skin, but otherwise the structure of the valves is the same as in the normal specimens; in the specimen from St. 22, on the other hand, the valves differ rather considerably from those of the normal specimens, the opening being broadly triangular with the lower edge almost or wholly straight (PI. XIII Fig. 9). On a closer examination I find that these s Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/echinoidea-of-the-swedish-south-polar-expedition-echinoideaofswed00mort-year-1910-io-til-mortensen-schwed-siidpolar-exp-also-the-pedicellariae-afford-some-differences-in-the-specimen-from-st-17-they-are-invested-by-an-unusually-thick-skin-but-otherwise-the-structure-of-the-valves-is-the-same-as-in-the-normal-specimens-in-the-specimen-from-st-22-on-the-other-hand-the-valves-differ-rather-considerably-from-those-of-the-normal-specimens-the-opening-being-broadly-triangular-with-the-lower-edge-almost-or-wholly-straight-pi-xiii-fig-9-on-a-closer-examination-i-find-that-these-s-image240651850.html
RMRYEHTX–Echinoidea of the Swedish South Polar Expedition echinoideaofswed00mort Year: 1910 io TIL MORTENSEN, (Schwed. Siidpolar-Exp. Also the pedicellariae afford some differences. In the specimen from St. 17 they are invested by an unusually thick skin, but otherwise the structure of the valves is the same as in the normal specimens; in the specimen from St. 22, on the other hand, the valves differ rather considerably from those of the normal specimens, the opening being broadly triangular with the lower edge almost or wholly straight (PI. XIII Fig. 9). On a closer examination I find that these s
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