Cœlenterata, pp. [471], [472]. Mollusca, pp. [472]-479. Chætopoda, p. [479]. Chætognatha, p. [479]. Arthropoda, pp. [479]-483. Vertebrata general, pp. [483]-490. Retina, pp. [490]-492. Optic nerve, pp. [492], [493]. Choroid fissure, p. [493]. Lens, pp. [494], [495]. Vitreous humour, pp. [494], [495]. Cornea, pp. [495]-497. Aqueous humour, p. [497]. Comparative development of Vertebrate eye, pp. [497]-506. Ammocœte eye, pp. [498], [499]. Optic vesicles, p. [499]. Lens, p. [499]. Cornea, p. [500]. Optic nerve and choroid fissure, pp. [500]-505. Iris and ciliary processes, p. [506]. Accessory organs connected with the eye, p. [506]. Eyelids, p. [506]. Lacrymal glands, p. [506]. Lacrymal duct, pp. [506], [507]. Eye of the Tunicata, pp. [507]-509. Accessory eyes in the Vertebrata, pp. [509], [510].
Chapter XVII. Auditory organ, Olfactory organ, and Sense organs of the Lateral line. Pp. [512]-541.
Auditory organs, pp. [512]-531. General structure of auditory organs, pp. [512], [513]. Auditory organs of the Cœlenterata, pp. [513]-515. Auditory organs of the Mollusca, pp. [515], [516]. Auditory organs of the Crustacea, p. [516]. Auditory organs of the Vertebrata, pp. [516]-530. Auditory vesicle, pp. [517]-524. Organ of Corti, pp. [524]-527. Accessory structures connected with the organ of hearing of terrestrial vertebrata, pp. [527]-530. Auditory organ of the Tunicata, pp. [530], [531]. Bibliography of Auditory organs, p. [531].
Olfactory organs, pp. [531]-538. Bibliography of Olfactory organs, p. [538]. Sense organs of the lateral line, pp. [538]-540. Bibliography of sense organs of lateral line, pp. [540], [541].
Chapter XVIII. The Notochord, the Vertebral Column, the Ribs, and the Sternum. Pp. [542]-563.
Introductory remarks on the origin of the skeleton, pp. [542]-544. Bibliography of the origin of the skeleton, pp. [544], [545]. The notochord and its cartilaginous sheath, pp. [545]-549. The vertebral arches and the vertebral bodies, pp. [549]-559. Cyclostomata, p. [549]. Elasmobranchii, pp. [549]-553. Ganoidei, p. [553]. Teleostei, p. [553]. Amphibia, pp. [553]-556. Reptilia, pp. [556], [557]. Aves, pp. [557], [558]. Mammalia, pp. [558], [559]. Bibliography of the notochord and vertebral column, p. [560]. Ribs, pp. [560]-562. Sternum, pp. [562], [563]. Bibliography of the ribs and sternum, p. [563].
Chapter XIX. The Skull. Pp. [564]-598.
Preliminary remarks, pp. [564], [565]. The cartilaginous cranium, pp. [565]-571. The parachordals and notochord, pp. [566], [567]. The trabeculæ, pp. [567]-570. The sense capsules, pp. [570], [571]. The branchial skeleton, pp. [572]-591. General structure of, pp. [572]-575. Mandibular and hyoid arches, pp. [575]-591. Elasmobranchii, pp. [576]-579. Teleostei, pp. [579]-581. Amphibia, pp. [581]-588. Sauropsida, pp. [588], [589]. Mammalia, pp. [589]-591. Membrane bones and ossifications of the cranium, pp. [592]-597. Membrane bones, pp. [592]-595. Ossifications of the cartilaginous cranium, pp. [595]-597. Labial cartilages, p. [597]. Bibliography of the skull, p. [598].
Chapter XX. Pectoral and Pelvic Girdles and the Skeleton of the Limbs. Pp. [599]-622.
The Pectoral girdle, pp. [599]-606. Pisces, pp. [599]-601. Amphibia and Amniota, pp. [601], [602]. Lacertilia, p. [603]. Chelonia, p. [603]. Aves, pp. [603], [604]. Mammalia, p. [604]. Amphibia, p. [605]. Bibliography of Pectoral girdle, pp. [605], [606].