Description: English: Alder J. & Hancock A. (1845-1855). A monograph of the British nudibranchiate Mollusca: with figures of all the species. The Ray Society, London. Published in 8 parts:Part 5 Fam.3 Plate 39 [1851]. Hermaea bifida (Montagu, 1815). Date: 1851. Source:
https://www.biodiversitylibrary.org/item/131598#page/462/mode/1up. Author: Albany Hancock.