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Petrushevskaya 1967


Fig. 10
Diploplegma (?) aquatica (Popofsky):
I - incomplete skeleton found in sediment; II - general view of adult specimen with single outer sphere; III - optical section through such a shell; IV - optical section through such a shell but with inner radial cross pieces broken off, outer sphere whole but not drawn; V - optical section through the shell with double outer sphere; VI - optical section through shell with triple outer sphere.