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2.Ayers, , Biological Lectures at Wood's Holl, 1893 [vol. ii.], p. 125, Boston, 1894. Muscles of the “tongue.”
3.Ayers, and Jackson, , Jour. Morph., vol. xvii. p. 185, 1901. Reprinted, Bull. Cincinnati Univ., Ser. II., vol. i., No. 1, 1900. Muscles of the “tongue.”
4.Cole, , Trans. R. Soc. Edin., vol. xli. p. 749, 1905.
5.Cole, , Anat. Anz., Bd. xxvii. p. 323, 1905.
6.Fürbringer, M., Gegenbaur's Festschrift, vol. iii. pp. 613 and 627, Leipzig, 1897. Parietalis, Rectus, Obliquus, Tentacularis posterior.
7.Fürbringer, P., Jena. Zeits., Bd. ix., N.F., ii. p. 1, 1875. Section A, § 2, published separately as an Inaug. Diss., Jena, 1874. General description of the muscles.
8.Greene, , Amer. Jour. Phys., vol. iii. p. 366, 1900. Science, vol. xv. p. 342, 1902. Cordis caudalis.
9.Grenacher, , Z. f. w. Z., Bd. xvii. p. 587, 1867. Also published as an Inaug. Diss., Leipzig, 1867. Parietalis.
10.Maurer, , Morph. Jahrb., Bd. xxi. p. 509, 1894. Histology of Parietalis.
11.Müller, J., Abh. Ak. Berlin, 1834, p. 243, 1836. General description of the muscles.
12.Müller, J., Abh. Ak. Berlin, Jahr 1843, p. 167, 1845. Sphincter cloacæ.
13.Pollard, , Anat. Anz., Bd. ix. p. 349, 1894. Zool. Jahrb., Abt. Morph., Bd. viii. p. 379, 1895. Muscles of tentacles.
14.Retzius, A. A., Kgl. Vet. Akad. Handlgr. Stockholm, p. 408, 1824. German translation, Isis, p. 1013, 1825. General remarks on the muscles.
15.Retzius, G., Biol. Unters., N.F., i. p. 94, 1890. Cordis caudalis.
16.Schaffer, , Z. f. w. Z., Bd. lxxx. p. 155, 1905. Histology of tendons of “tongue” muscles.
17.Schneider, , Beit. z. vergleich. Anat. u. Entwick. d. Wirbelthiere, Berlin, 1879. Parietalis, “Tongue” muscles, Obliquus, Rectus, Transversus caudalis.
18.Schneider, , Zool. Beiträge, ii., Breslau, 1887. Histology of Myxinoid muscle.
19.Schreiner, , Bergens Mus. Aarbog, 1898, No. i., 1899. Visceral muscles, Constrictor pharyngis, Constrictor branchiarum et cardiæ.
20.Wiedersheim, , Lehrbuch d. vergleich. Anat. d. Wirbelthiere, pp. 232–3, Jena, 1883. Body musculature.
21.Wikström, , Anat. Anz., Bd. xiii. p. 401, 1897. Body musculature.