PLATE 2.
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.