Above, two tortoises, a sand piper, a heath cock, a scambroidean fish and a sprig of a tea plant; below, a fish, a branch of a theobroma tree, a morse (walrus), a nematode worm and a scombroidean fish. Engraving by Heath.

Licence: Public Domain Mark

Credit: Above, two tortoises, a sand piper, a heath cock, a scambroidean fish and a sprig of a tea plant; below, a fish, a branch of a theobroma tree, a morse (walrus), a nematode worm and a scombroidean fish. Engraving by Heath. Wellcome Collection. Source: Wellcome Collection.