The works of Francis Maitland Balfour, Volume 3 (of 4)
CHAPTER V. CYCLOSTOMATA. Pp. 83-101.
Segmentation and formation of the layers, pp. 83-86. Mesoblast and notochord, pp. 86, 87. General history of the development, pp. 87-97. Metamorphosis, pp. 97-100. Myxine, p. 100.