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Cleve 1899

Plate 3

Fig. 1. Peridium (?) minutum CL. b and c The same shell in different foci.
Fig. 2. Phorticium pylonium HKL. a, b, c The shell in different state of development, d The primordial shell.
Fig. 3. Plectanium (?) simplex CL.
Fig. 4. Polypetta holostoma CL. a The shell, b Structure
Fig. 5. Theocorys borealis CL.