6. _Sub-Genus_--CREUSIA, _Leach_. (Darwin, 'Balanidæ,' p. 375.)
Valvæ testæ 4, radiis instructæ; basis cyathiformis, coraliis affixa.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · 第 192 / 417 题