The cleansing of the littoral by the lugworm, Arenicola marina / by James Hornell. On the locomotion of the mollusca / by Joseph Sinel. The colour scale in marine animals / by James Hornell. Microscopical studies in marine zoology. Study 4. Sponges -- Study 5. Copepod (Monstrilla anglica). -- Study 6. Lancelet (Amphioxus lanceolatus) / by James Hornell