[33] De generatione animalium, i. 22; 730ᵇ 10.
[34] De generatione animalium, i. 22; 730ᵅ 34.
[35] Historia animalium, vi. 3; 561ᵅ 4.
[36] Cor primum movens ultimum moriens. This famous sentence is the sense though not the phrasing of De generatione animalium, ii. 1 and 4.
[37] Historia animalium, vi. 3; 561ᵅ 18.
[38] De generatione animalium, iii. 9; 758ᵅ 37.
[39] Historia animalium, i. 5; 489ᵅ 35.
[40] Historia animalium, vi. 10; 565ᵇ 2.
[41] The history of this discovery is given by Charles Singer, Studies in the History and Method of Science, vol. ii, Oxford, 1921, pp. 32 ff.
[42] Johannes Müller, Ueber den glatten Hai des Aristoteles, Berlin, 1842.