The purpose of the BMLSS is:

• The study of the marine fauna and flora of the shore and seas surrounding the British Isles.

• The publication and distribution of knowledge of marine life and the marine environment of the British Isles.

• Promotion of ideas and projects concerning the conservation of the British marine environment.

These aims are included as the main purpose of the BMLSS in the Constitution. The full Constitution document clarifies these aims where there is a possibility that the message is not clear. The full Constitution is available by written request to Glaucus House (address on the BMLSS Home Page) with a SAE.

The BMLSS is a voluntary unincorporated society, run on a non-profit making basis. Although not a Registered Charity, the BMLSS follows the rules applicable to Registered Charities as far as possible..

The motto of the BMLSS is 'Vincit Omnia Veritas' = Truth Conquers All.

The journal title 'Glaucus' derives from Greek mythology and means the colour of the sea. It is the generic name for a species of sea slug and this animal is represented on the logo. 'Glauca' is the specific name of the Blue Shark.