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Petrushevskaya 1971


Figure 14

Structure of the so-called spiny skeletons.
I) Triplagia primordialis; II) Plagoniscus tripodiscus; III) Plagiocarpa procortina; IV) Cortina typus (according to Haeckel, 1887); V, VI) same specimen of Neosemantis sp. from Miocene sediments (AMPH 6P, No. 3, H 42/3), from below and laterally; VII) Campylacantha (?) sp. from the same sample (V-VII original); VIII) scheme of Plagoniscus, classic tripod, the three rays of which are placed opposite the fourth spine (lateral, anteriorly and from above); IX) scheme of Triplagia, also a tripod, but without a fourth spine (VIII, IX, according to Popofsky, 1913); X) scheme of the structure of Plagiacantha and Campylacantha (according to our data); XI) same for Neosemantis (X, XI original). Other designations same as in figs. 8 and 10.