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

by Charles Darwin

Sectio A.

Parietes et basis et radii poris perforati.

Sectio B.

Parietes et basis interdum poris perforati; radii nunquam; testæ axis rostro-carinalis elongatus; basis cymbiformis, Gorgoniis et Milleporis affixa.

Sectio C.

Parietes et basis semper poris perforati; radii nunquam.

Sectio D.

Parietes semper poris perforati; basis et radii nunquam.

Sectio E.

Basis membranacea.