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And, as if to make the case as striking as possible, this sessile cirripede was a Chthamalus, a very common, large, and ubiquitous genus, of which not one specimen has as yet been found even in any tertiary stratum.
Already, one inferred, a sort of censorship was at work, an effective if comparatively modest precursor to that noble volunteer committee which was presently with touching spontaneity to fasten itself upon an astonished Ship of State before it could gather enough way to escape such cirripede attachments.
This was a sore trouble to me, adding, as I then thought, one more instance of the abrupt appearance of a great group of species. But my work had hardly been published, when a skilful palaeontologist, M. Bosquet, sent me a drawing of a perfect specimen of an unmistakable sessile cirripede, which he had himself extracted from the chalk of Belgium.
It was after Darwin had got rid of his herculean labors over the "Cirripede" book, that he began to settle down seriously to the great work of his life the investigation of the origin of the species, of plants and animals.
While on the coast of Chili he had found a curious new cirripede, to understand the structure of which he had to examine and dissect many of the common forms.
And, as if to make the case as striking as possible, this sessile cirripede was a Chthamalus, a very common, large, and ubiquitous genus, of which not one specimen has as yet been found even in any tertiary stratum.
I can thus only understand a fact with which I was much struck when examining cirripedes, and of which many other instances could be given: namely, that when a cirripede is parasitic within another and is thus protected, it loses more or less completely its own shell or carapace.
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