Liste des diatomées et des desmidiées observées dans les environs de Paris précédée d'un essai de classification des diatomées

First edition printed in a small number of copies of this offprint.
Signed autograph inscription from Paul Petit.
Illustrated brochure with 2 plates hors-texte.
Spine slightly cracked, spine and covers lightly and marginally sunned, a small angular lack at head of front cover, handsome interior condition.