_Genus_--BALANUS.
Fig. 1, Balanus quadrivittatus.
2 _a_, Balanus terebratus, part of basis seen from the
outside; 2 _b_, the same, seen from within.
3 _a_, Balanus vestitus, scutum, internal view; 3 _b_,
tergum, external view.
4 _a_, Balanus imperator, scutum, internal view; 4 _b_,
tergum, external view; 4 _c_, portion of basal edge of wall
of the shell.
5 _a_, Balanus flosculus.
5 _b_, " " _var._ sordidus.
5 _c_, " " scutum, internal view.
5 _d_, " " " " _var._
5 _e_ and 5 _f_, " tergum, internal and external views of.
6 _a_, Balanus bisulcatus, scutum, external view; 6 _b_,
tergum, external view; 6 _c_, scutum, internal view.
7, Balanus dolosus, tergum, external view.
8 _a_, Balanus unguiformis, scutum, internal view; 8 _b_,
tergum, do.
9, Balanus varians, tergum, external view.
10 _a_, Balanus inclusus.
10 _b_, " " _var._ that has been attached to a
branch of a coralline.
10 _c_, " " " seen from beneath, showing the
narrow furrowed basis and wide
lateral compartments; the other
four compartments, namely, the
two carino-lateral, the carina,
and rostrum, being of very small
size.