A Monograph on the Sub-class Cirripedia · Charles Darwin
PLATE 8.
_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.
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