Not quite how I remembered it, from the 1964 Treatise on Nautiloids.
(3) Flower R. H. 1955 Trails and tentacular impressions of orthoconic cephalopods, Journal of Paleontology, v. 29, p. 857-867
(3) Flower R. H. 1955 Trails and tentacular impressions of orthoconic cephalopods, Journal of Paleontology, v. 29, p. 857-867