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.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · 第 201 / 417 题