Fictitious and Symbolic Creatures in Art, by John Vinycomb, , at sacred-texts.com
or Lion poisson, a mythical sea-creature, frequently used in heraldry as an emblem of bold actions achieved on the ocean in the country's service. It is depicted as the fore part of a lion with webbed feet, the hinder part ending in a fish's tail.
Two such animals support the arms of Viscount Falmouth.
The Earl of Howth has for supporters a sea-lion
argent, and a mermaid, proper. The crest also is a sea-lion.
The crest of Duckworth is a tower, the battlements partly demolished, from
Silvestre.—Argent, a sea-lion couchant azure, crowned armed and langued gules.
When the sea-lion or other compounded creature of this kind is erect, it should be clearly blazoned as "a sea-lion erect on his tail," to distinguish it from naiant, the swimming position natural to it.