Behavior of the lower organisms,

Mode of access: Internet.

The Riverside natural history.

First published 1883-85 with title: The standard natural history

Laboratory exercises for experimental invertebrate zoology,

Mode of access: Internet.

Die Stämme des Thierreiches : wirbellose Thiere /

No more published.

Systematische Phylogenie : Entwurf eines natürlichen Systems der Organismen auf Grund ihrer Stammesgeschichte /

Includes bibliographical references and indexes.

Macroinvertebrate gear evaluation /

Includes abstract.