PLANCUS, J.

De Conchis minus notis liber. Cui accessit Specimen aestus reciproci maris superi ad littus portumque Arimini. Editio altera duplici appendice aucta.

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Romae, in aedibus Palladis, 1760. 4to (273 x 205mm). pp. 136, with engraved title-vignette and 24 engraved plates. Contemporary green vellum, spine with red gilt lettered label (joints splitting at head).

The fine plates show marine animals of the Adriatic sea such as shells and crustacean

The first edition appeared in 1739, with a much shorter text and five plates only. The name Janus Plancus is the pseudonym of S.G. Bianchi. Bianchi (1693-1775) was a physician, scientist and polygraph from Rimini.
The fine plates show marine animals of the Adriatic sea such as shells and crustacean. The book also gives one of the earliest descriptions of foraminifera which were collected by the author on the beach of Rimini. "... Plancus versuchte, Schalen lebender Thiere zu finden, welche Ammonshörnern in ihrer Bildung entsprachen. Er schilderte einige analoge, aber mikroskopische Schalen... Hiermit wurden die Rhizopodenformen entdeckt, welche man.. heute Polythalamien nennt" (Carus p. 458).

Nissen ZBI, 356; Caprotti p. 39.