John Gwyn Jeffreys eBooks
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British Conchology: Or an Account of the Mollusca Which Now Inhabit the British Isles and the Surrounding Seas. E-book. Formato PDF
John Gwyn Jeffreys
edizioni Forgotten Books collana , 2017
Body elongated in a transverse direction: mantle closed in front, with its borders adhering together, open at the anterior end for the passage of a foot, and forming at the posterior end two conical tubes or siphons of different lengths, which are more or less enclosed in a common sheath: gills two on each side, long...