[17] ‘Schweineschädel’ s. 74, 135. [18] Nathusius, ‘Die Racen des Schweines,’ s. 71. [19] ‘Die Racen des Schweines,’ s. 47. ‘Schweineschädel’ s. 104. Compare, also, the figures of the old Irish and the improved Irish breeds in Richardson on ‘The Pig,’ 1847. [20] Quoted by Isid. Geoffroy, ‘Hist. Nat. Gén.,’ tom. iii. p. 441. [21] S. Sidney, ‘The Pig,’ p. 61. [22] ‘Schweineschädel,’ s. 2, 20. [23] ‘Proc. Zoolog. Soc.,’ 1837, p. 23. I have not given the caudal vertebræ, as Mr. Eyton says some might possibly have been lost. I have added together the dorsal and lumbar vertebræ, owing to Prof. Owen’s remarks (‘Journal Linn. Soc.,’ vol. ii. p. 28) on the difference between dorsal and lumbar vertebræ depending only on the development of the ribs. Nevertheless the difference in the number of the ribs in pigs deserves notice. M. Sanson gives the number of lumbar vertebræ in various pigs; ‘Comptes Rendus,’ lxiii. p. 843. [24] ‘Edinburgh New Philosoph. Journal,’ April, 1863. _See also_ De Blainville’s ‘Ostéographie,’ p. 128, for various authorities on this subject. [25] Eudes-Deslongchamps, ‘Mémoires de la Soc. Linn. de Normandie,’ vol. vii., 1842, p. 41. Richardson, ‘Pigs, their Origin, etc.,’ 1847, p. 30. Nathusius, ‘Die Racen des Schweines,’ 1863, s. 54. [26] D. Johnson’s ‘Sketches of Indian Field Sports,’ p. 272. Mr. Crawfurd informs me that the same fact holds good with the wild pigs of the Malay peninsula. [27] For Turkish pigs _see_ Desmarest, ‘Mammalogie,’ 1820, p. 391. For those of Westphalia _see_ Richardson’s ‘Pigs, their Origin, etc.,’ 1847, p. 41.