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

by Charles Darwin

Sub-Familia 1. [BALANINÆ.] (Darwin, ‘Balanidæ,’ p. [175].)

Rostrum cum radiis, sed sine alis; valvæ testæ laterales omnes, ex uno latere alis, ex altero radiis instructæ: parietes ferè aut porosi aut ad interiorem superficiem longitudinaliter costati.

[Sectio †.]

Scutum et tergum inter se articulata aut mutuò interclusa: branchiarum unaquæque ex unicâ plicâ constat.

1. [Genus—BALANUS], Auctorum. (Darwin, ‘Balanidæ,’ p. [177].)

Valvæ testæ 6; basis calcarea aut membranacea; valvæ operculares subtriangulares.

2. [Sub-Genus—ACASTA], Leach. (Darwin, ‘Balanidæ,’ p. [302].)

Valvæ testæ 6; parietes et basis non porosa; basis calcarea, cyathiformis, non elongata. Spongiis, aut rarò Isidis cortici, affixa.

3. [Genus—TETRACLITA], Schumacher. (Darwin, ‘Balanidæ,’ p. [321].)