4. _Genus_--OXYNASPIS, _Darwin_. ('Lepadidæ,' p. 133.)
Valvæ 5, approximatæ; scutorum umbones in medio marginis occludentis
positi; carina rectangulè flexa, sursùm inter terga extensa, termino
basali simpliciter concavo.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · 第 209 / 417 题