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. |
