2. _Genus_--PŒCILASMA, _Darwin_. ('Lepadidæ,' p. 99.)
Valvæ 3, 5, aut 7, approximatæ; carina solùm ad basales apices
tergorum extensa, termino basali aut truncato aut in discum profunde
infossum producto; scuta pænè ovalia, umbonibus ad angulum rostralem
positis.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · 第 207 / 417 题