3. _Genus_--DICHELASPIS, _Darwin_. ('Lepadidæ,' p. 115.)
Valvæ 5, quæ ferè pro septem haberi possent, scuto in segmenta planè
duo, ad angulum autem rostralem conjuncta, diviso; carina plerumque
sursum inter terga extensa, deorsum aut disco infosso aut furcâ aut
calyce terminata.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · 第 208 / 417 题