(1) System der Siphonophoren auf Phylogenetischer Grundlage entworfen; (2) Plankton-Composition; (3) Die cambrische Stammgruppe der Echinodermen.
Jena: [Hermann Pohle], 1888, 1892, 1895. 8vo. [ii], 46; [ii], 8, [2]; 12 pp., including illustrations. FIRST EDITIONS. Three original offprints. Fro:m Jenaische Zeitschrift für Naturwissenschaft. Separately bound in recent boards. Presentation copies, signed by Haeckel to Dr. Bernhard Rawitz, anatomist from the University of Berlin. THREE VALUABLE PAPERS; ALL..... More