1. Cerastoderma edule. Ctenidium (gill) folded into 4 lamellae (layers), W in cross section. Fine mesh of fused filaments just visible if picture magnified to maximum. Used for respiration and filtering food particles.
2. Cerastoderma edule. Ctenidium (gill) folded into 4 lamellae (layers), W in cross section. Fine mesh of fused filaments just visible if picture magnified to maximum. Used for respiration and filtering food particles.

Cerastoderma edule. Ctenidium (gill) folded into 4 lamellae (layers), W in cross section. Fine mesh of fused filaments just visible if picture magnified to maximum. Used for respiration and filtering food particles.