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.