3. _Acasta cyathus_, Darwin. ('Balanidæ,' p. 312, Tab. 9, fig. 3.)
A. parietibus carino-lateralibus ferè 1/4 parietum lateralium
latitudine: radiis latioribus quam parietes: basi pæne planâ, exiguâ:
tergi calcare truncato, 1/2 valvæ latitudine.
_Hab._--In Madeirâ et Indiâ occid.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2) The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc. · 第 254 / 417 题