- Fig. 1 a, Balanus improvisus; 1 b, scutum, internal; 1 c, tergum, external view.
- 2 a, Balanus nubilus, scutum, internal view; 2 b, tergum, ditto; 2 c, tergum, external view.
- 3 a, 3 b, Balanus corrugatus, scutum and tergum, internal view.
- 4 a, Balanus porcatus; 4 b and 4 c, scutum and tergum, internal views; 4 d, tergum external; 4 e, basal edge of the parietes of wall of shell.
- 5 a, Balanus patellaris; 5 b, scutum, internal; 5 c, tergum, external.
- 6 a, Balanus crenatus.
- 6 b,””smooth var.
- 6 c,””elongated var.
- 6 d and 6 e,”scutum and tergum, external views.
- 6 f and 6 g,”””internal views.