04 Trinchesia foliata

04 Trinchesia foliata

The cerata occasionally have an olive green internal digestive gland, which was probably the reason for Alder & Hancock’s name of Eolis olivacea for the species.
The contents of the ceratal digestive gland are sometimes visibly arranged in transverse bands. Image from Family 3 Plate 26 in Alder & Hancock (1845-1855).