On Abnormal Conditions of the Gills inMytilus edulis. Part II. Structural Abnormalities, with a Note on the Method of Division of the Mantle Cavity in Normal Individuals

Abstract

In the examination of a total of about twenty-four thousand mussels from various localities in Devon and Cornwall—estuaries of the Fal, Hamoaze, Yealm, Teign and Camel, and the Promenade Pier, Plymouth— it has been observed that those from various parts of the Fal Estuary included a high percentage of specimens with the gills in an abnormal condition, whereas such abnormalities were rare or absent in other localities.