Others lived unattached in soft substrates (mud or sand), anchoring themselves in place with spines, lying flat on the bottom, or leaning against each other in large masses. See figure 12-9 in your ...

Ventral view of Mucrospirifer, a fossil brachiopod, showing the characteristically wing-like shell. This Devonian specimen from Ohio is 3.5cm wide. Brachiopod hard parts have excellent preservation ...