Umbrella shell

(Zool.) See Umbrella, 3.

See also: Umbrella

References in periodicals archive ?
The first part of the book provides introductory information on the higher taxonomy, external and internal anatomy, reproduction, habitats, biotic relationships and behaviour of nudibranchs and related molluscs, followed by text descriptions and illustrations of 173 species of nudibranch and 76 other species including bubble shells, sap-sucking sea slugs, sea hares, umbrella shells and side-gilled slugs.
Optimization of concrete hyperbolic paraboloid umbrella shells, Available from: http://www.