[232]

Newton Parker, Trans. Roy. Irish Acad. xxx. 1892, p. 140.

[233]

Günther, Phil. Trans. 161, 1871, pp. 542-543.

[234]

Owen, Anat. Phys. Vertebrates, London, 1866, i. p. 424.

[235]

For the histology of the alimentary canal and its glands in Fishes, see Leydig, Lehrb. d. Histol. d. Menschen u. d. Tiere, 1857; Id. Beitr. zu mikrosk. Anat. u. Entwickl. d. Rochen u. Haie, Leipzig, 1852; Id. Anat.-histol. Untersuch. üb. Fische u. Reptilien, Berlin, 1853; Molin, Sitz. d. k. Akad. d. Wiss. zu Wien, v. 1850, p. 416; Macallum, Proc. Canadian Inst. N.S. ii. 1884, p. 387; Id. Journ. Anat. and Phys. xx. 1886, p. 604; N. Parker, Trans. Roy. Irish Acad. xxx. 1893, p. 109; Ayers, Jen. Zeitsch. xviii. 1885, p. 479; Edinger, Archiv f. mikr. Anat. xiii. 1876, p. 651; Trinkler, Archiv f. mikr. Anat. xxiv. 1884, p. 174. Also Oppel, Lehrb. d. vergl. mikrosk. Anat. d. Wirbeltiere, i.-ii. Jena, 1896-97, where numerous other references are given.

[236]

Owen, op. cit. p. 418.