I have already under the Family sufficiently entered on the relations of the [Balaninæ] to the [Chthamalinæ], and of the genera, one to the other, so that I need not here add anything.
I can point out no difference in habits or geographical distribution between the [Balaninæ] and [Chthamalinæ].
1. Genus—BALANUS, Auct.[83]
[83] The name Balanus was used, almost as at present, by Lister and Hill, before the introduction of the binomial system. Since that period the first two authors, as far as I know, who used this name, were Da Costa, in his ‘Hist. Nat. Test. Brit.,’ in 1778; and Bock, in the ‘Naturforscher,’ for the same year; Bock, however, applied it to a [Chelonobia].
CONOPEA (pars generis). Say. Journal Nat. Sc. Philadelphia, vol. ii, part ii, 1822.
MESSULA (do.). Leach. Zoological Journal, vol. ii, 1825.
CHIRONA (do.). J. E. Gray. Philosoph. Transacts., 1835, p. 37.
Compartments six; basis calcareous or membranous; opercular valves sub-triangular.
Distribution.—Mundane: in the warmer seas.