Scalibregma celticum new species (Polychaeta: Scalibregmatidae) from Europe, with a redescription of Scalibregma inflatum Rathke, 1843 and comments on the genus Sclerobregma Hartman, 1965. Bulletin of Marine Science, 48(2) 1991: 268-276. 271 [Zoological Record Volume 128]