A Monograph on the Sub-class Cirripedia (Volume 2 of 2) / The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc.

by Charles Darwin

Fig. 4.

Fig. 2. Compartment with two radii, serving either as a Rostrum or Rostro-lateral compartment.
Fig. 3. serves as a Lateral and Carino-lateral Compartment.
Fig. 4. serves as a Carina or Rostrum.

OPERCULAR VALVES.

Fig. 5. SCUTUM (internal view of).

Fig. 6. TERGUM (external view).