- Fig. 1 a, Elminius modestus; 1 b, scutum, internal view; 1 c, tergum, internal view; 1 d, do., tergum, var.; 1 e, do., tergum, var.
- 2 a, Elminius plicatus; 2 b, basal edge of portion of wall of shell; 2 c and 2 d, scutum and tergum, internal views of; 2 e and 2 f, scutum and tergum, internal views of, var.
- 3, Elminius simplex; shell.
- 4 a, Pyrgoma Anglicum; 4 b and 4 c, scutum and tergum, internal views.
- 5 a, Pyrgoma cancellatum, shell, seen from above; 5 b, shell seen on the under side; 5 c and 5 d, scutum and tergum, external views; 5 e and 5 f, scutum and tergum, internal views of.
- 6, Pyrgoma Stokesii, shell imbedded in coral.
- 7 a, Pyrgoma conjugatum, shell, external view of; 7 b, scutum and tergum, calcified together, seen from the outside; 7 c, do., internal view of.