Figure 74
Various forms of Trisulcus borealis(Ehr.)
I) T. borealis typ., surface layer of the bottom sediment, Norwegian Sea, “Sevastopol” station 1056; II-VI) tropical T. borealis, plankton, Indian Ocean, “Obj”, 61st sample of suspension, 5 specimens in various positions; VII, VIII) Antarctic form of T. borealis, surface layer of the sediment, Antarctic “Obj”: VII) left; VIII) right.
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