The Hydroida of the Pacific coast of North America.

Mode of access: Internet.

Beitrag zur Kenntnis der Hydromedusen /

Mode of access: Internet.

A monograph of the gymnoblastic or tubularian hydroids /

Each plate preceded by leaf with descriptive letterpress.

Mémoires pour servir à l'histoire d'un genre de ploypes d'eau douce, à bras en forme de cornes.

Mode of access: Internet.

A monograph of the British naked-eyed Medusæ: with figures of all the species.

Mode of access: Internet.