_Genus_--BALANUS.
Fig.
1 _a_, Balanus tintinnabulum,--_var._ communis, scutum.
1 _b_, " " " occator "
1 _c_, 1 _d_, and 1 _e_, " " " communis "
1 _f_, " " " coccopoma "
1 _g_, " " " concinnus "
1 _h_, (magnified) " " (_young_) " vesiculosus "
1 _i_, and 1 _k_, " " " communis, tergum.
1 _l_, " " " coccopoma "
1 _m_,and 1 _n_, " " " d'Orbignii "
1 _o_, " " " coccopoma "
2 _a_, 2 _b_, 2 _c_, 2 _d_, Balanus tulipiformis, scutum and
tergum, external and internal views of.
3 _a_, 3 _b_, 3 _c_, 3 _d_, Balanus psittacus, scutum and tergum,
external and internal views of.
4 _a_, 4 _b_, Balanus Capensis, scutum and tergum, internal view of.
5 _a_, 5 _b_, Balanus nigrescens " "
6 _a_, Balanus decorus, scutum, internal view; 6 _b_, tergum,
external view.
7 _a_, Balanus vinaceus, scutum, internal view; 7 _b_, do.
external view; 7 _c_, tergum, external view; 7 _d_, basal
edge of the parietes of one of the compartments, showing the
cancellated structure of the inner lamina.