Whelk

Definition and stakes

Andrew Wilson,  Popular Science Monthly (1881)

“ That higher forms of life than the sea-squirt and insect race are by no means exempt from the influence of retrogressive change is an observation worth noting at the close of our researches. We know, for instance, of lowly structures in shell-fish life appearing in the midst of highly organized frames. A mussel, a cockle, or an oyster, whose early development runs in parallel lines to that of the snail and whelk class, is nevertheless esteemed less highly organized than the latter. ”
Source: Wikisource

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