Group I | Group II | ||
P | Pedicle Foramen | 1 | Trilobita |
Q | Pallial Sinus | 2 | Cephalopoda |
R | Pygidium | 3 | Pelecypoda |
S | Siphuncle | 4 | Brachiopoda |
Group I | Group II |
P. Dissepiment | 1. Echinodermata |
Q. Delthyrium | 2. Trilobita |
R. Pygidium | 3. Brachiopoda |
S. Ambulacrum | 4. Anthozoa |