_Genera_--ELMINIUS AND PYRGOMA.
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.