5. _Genus_--PYRGOMA, _Leach_. (Darwin, 'Balanidæ,' p. 354.)
Valvæ testæ in unam confluentes; basis cyathiformis aut subcylindrica,
coraliis affixa.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · 第 191 / 417 题