46. OLDENBURG, HY., “Giving some Account of the Present Undertakings, Studies, and Labours, of the Ingenious in many considerable parts of the World,” _Philos. Trans._, vol. 1, Anno 1665 and 1666, p. 703. 47. PANIZZA,       , “Sulla struttura del cuore e della circolazione del sangue del _Crocodilus lucius_,” _Biblioteca Italiana_, vol. 60, 1887 (?). 48. PARKER, W. K., _On the Structure and Development of the Skull in the Crocodile_, London, 1882; rev. _Trans. Zoöl. Soc. London_, vol. 11 or 12, pp. 263-310; _Nature_, vol. 26, pp. 252-54, 1882. 49. PARKER and HASWELL, _Text-book of Zoölogy_. 1897. 50. PETERS, W., “Über das Gehörknöchelchen und den Meckel’schen Knorpel bei den Crocodilen,” _Monatsb. der königl. preuss. Akademie der Wiss. zu Berlin_, p. 529, 1868. 51. ---- “Über die Höhlen des Unterkiefers bei den Crocodilen,” _ibid._, p. 15, 1870. 52. POELMANN, C., “Note sur le système circulatoire des Crocodiliens,” _Bull. de l’Acad. Belgique_, vol. 21, pp. 67-72, 1854; _L’Institute_, vol. 23, p. 213, 1854. 53. RABL-RÜCKHARD, “Das Centralnervensystem des Alligators,” _Zeitsch. f. Wiss. Zool._, vol. 30, pp. 336-73, 1878. 54. RATHKE, C., _Untersuchungen über die Entwickelung und den Körperbau der Crocodile_. Braunschweig, 1866. 55. REESE, A. M., “The Nasal Passage of the Florida Alligator,” _Proc. Phila. Acad. Nat. Sci._, pp. 457-64, 1901. 56. ---- “Artificial Incubation of Alligator Eggs,” _Amer. Nat._, vol. 35, no. 411, pp. 193-95, March, 1901. 57. ---- “A Double Embryo of the Florida Alligator,” _Anat. Anz._, vol. 28, nos. 9 and 10, pp. 229-31, 1906. 58. ---- “The Development of the American Alligator,” _Smithsonian Misc. Coll._, no. 1791, pp. 1-66, 1908. 59. ---- “The Breeding Habits of the Florida Alligator,” _ibid._, no. 1696, pp. 381-86, 1907. 60. ---- “The Home of the Alligator,” _Pop. Sc. Monthly_, pp. 365-72, Oct., 1910. 61. ---- “Development of the Digestive Canal of the American Alligator,” _Smith. Misc. Coll._, no. 1946, pp. 1-25, 1910. 62. ---- “The Development of the Brain of the American Alligator: The Paraphysis and Hypophysis,” _Smith. Misc. Coll._, no. 1922, pp. 1-20, 1910. 63. ---- “The Histology of the Enteron of the Florida Alligator,” _Anat. Record_, vol. 7, no. 4, pp. 105-29, April, 1913. 64. ---- “The Vascular System of the Florida Alligator,” _Proc. Phila. Acad. Nat. Sc._, pp. 413-25, 1914. 65. RÖSE, C., “Über die Zahnentwickelung der Krokodile,” _Verhandl. d. anat. Gesellsch._, Jena, vol. 6, pp. 225-27, 1892; also _Morph. Arb._, Jena, vol. 3, pp. 195-228, 1893-4. 66. ---- “Über die Verwachsung von retinierten Zähnen mit den Kieferknochen,” _Anat. Anz._, pp. 82-89, 8 Jahr, 1893. 67. ---- “Über das rudimentäre Jacobsonschen Organ der Krokodile und des Menschen,” _Anat. Anz._, pp. 458-72, 8 Jahr, 1893.