12. _Genus_--CHTHAMALUS, _Ranzani_. (Darwin, 'Balanidæ,' p. 447.)
Valvæ testæ 6; basis membranacea, sed interdum ad speciem calcarea,
ideò quod parietes inflectuntur.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · 第 199 / 417 题