Alepas. Sander Rang. Manuel des Mollusques, 1829.
Anatifa. Quoy et Gaimard. Voyage de l’Astrolabe, 1834.
Triton. Lesson. Voyage de la Coquille, 1830.
Cineras. Lesson. Secundum Sander Rang.
Capitulum aut sine valvis, aut scutis corneis, pæne abditis.
Capitulum without valves,[41] or with horny, almost hidden, scuta.
[41] Any one not attending to the characters derived from the softer parts of the Balanidæ and Lepadidæ, might easily confound with Alepas the genus Siphonicella (genus nov.), which, undoubtedly, though having the external appearance of a pedunculated cirripede, belongs to the Balaninæ, and is closely related to Coronula.
Filaments seated beneath the basal articulations of the first pair of cirri; mandibles, with two or three teeth; maxillæ notched, with the lower part irregular, projecting; caudal appendages multi-articulate.
Attached to various living objects, fixed or floating.
Capitulum either entirely destitute of valves, or with transparent horny scuta, not containing any calcareous matter, and almost hidden in membrane. These scuta are formed of a lower and a lateral lobe, placed at above right angles to each other; they are added to by successive layers, and closely resemble in shape the scuta of the [Conchoderma aurita]. The orifice in A. tubulosa projects so much as to be almost tubular. In A. parasita and A. minuta it does not project, and is either moderately large, or very small in proportion to the length of the capitulum; from contraction it is much wrinkled. The membrane forming the capitulum is smooth and very transparent; it contains very few tubuli, except under certain irregular projections in A. cornuta.