Note 30 — DESCRIPTIONS OF SKULLS AND SKELETONS OF ZIPHIOID WHALES.
Reading edition
“The slight differences pointed out by Mr. True appear to be individual or local rather than specific.” (Van Beneden, Les Ziphioïdes des mers d’Europe, 1888, p. 100.) See also James A. Grieg, Bergens Museums Aarbog, 1897, No. 5, p. 19.