2 literature references for Vibulinus rigidus (Montagu, 1818):

Author: Montagu, G.
Year: 1818
Title: An Essay on Sponges, with Descriptions of all the Species that have been discovered on the Coast of Great Britain.
Source: Memoirs of the Wernerian Natural History Society 2(1): 67-122,pls III-XVI.
Author: Topsent, E.
Year: 1890
Title: Éponges de la Manche.
Source: Mémoires de la Société zoologique de France 3(1): 195-205.