A Monograph on the Sub-class Cirripedia · Charles Darwin
PLATE 10.
_Genus_--TETRACLITA. Fig. 1 _a_, Tetraclita porosa, _var._ communis. 1 _b_, " " " rubescens. 1 _c_, " " " nigrescens. 1 _d_, " " " elegans. 1 _e_, " " " communis, young, with radii developed. 1 _f_, " " " patellaris. 1 _g_, " " basal edge of wall of shell. 1 _h_, " " basal edge of wall of shell, _var._ elegans, showing also the structure of one of the rudimentary radii or sutures. 1 _i_, " " internal view of scutum; 1 _k_, do. of tergum; 1 _l_, do. of scutum, _var._; 1 _m_, do. of tergum, _var._ 2 _a_, Tetraclita serrata; 2 _b_, portion of external surface of wall, low down, near basis; 2 _c_ and 2 _d_, scutum and tergum, internal views. 3 _a_, Tetraclita rosea, scutum; 3 _b_, tergum; 3 _c_, whole shell; 3 _d_, basal edge of wall of shell.
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