MV Ancylus was one of nine Anglo Saxon Royal Dutch/Shell oil tankers converted to become a Merchant Aircraft Carrier (MAC ship).

MV Ancylus was built at Swan Hunter and completed in January, 1935 as an oil tanker for the Anglo Saxon Royal Dutch/Shell line.

[1] As a MAC ship, she had no aircraft hangar, and continued to carry normal cargoes, although operating under Royal Navy control.

[2] At the end of the war, Ancylus was reconverted to an oil tanker, being renamed Imbricaria in 1952.

She served in this capacity until broken up for scrap at La Spezia in December 1954.