Sub-Familia 2. [CHTHAMALINÆ.] (Darwin, ‘Balanidæ,’ p. [446].)
Rostrum cum alis sed sine radiis; valvæ rostro-laterales utrinque sine alis; parietes non porosi.
12. [Genus—CHTHAMALUS], Ranzani. (Darwin, ‘Balanidæ,’ p. [447].)
Valvæ testæ 6; basis membranacea, sed interdum ad speciem calcarea, ideò quod parietes inflectuntur.
13. [Genus—CHAMÆSIPHO], Darwin. (‘Balanidæ’ p. [470].)
Valvæ testæ 4, suturis sæpe admodùm obliteratis; basis membranacea.
14. [Genus—PACHYLASMA], Darwin. (‘Balanidæ,’ p. [475].)
Valvæ testæ, conchâ recenter natâ, 8; adultâ aut 6, aut ad speciem 4, ideò quod valvæ laterales arctè conjunguntur; basis calcarea.
15. [Genus—OCTOMERIS], G. B. Sowerby. (Darwin, ‘Balanidæ,’ p. [482].)
Valvæ testæ 8; radii marginibus crenatis; basis membranacea.