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

by Charles Darwin

Fig. 2.

Fig. 3.

p, p, Parietes; r, r, Radii; a, a, Alæ.

Fig. 1, Rostrum with two radii, serving in the [Chthamalinæ] for rostro-lateral compartments.

Fig. 2, always serving for lateral and carino-lateral compartments.