_The solid oesophagus._--OEsophagus originally hollow. Becomes solid during Stage K. _The postanal section of the alimentary tract._--Continuity of neural and alimentary canals. Its discovery by Kowalevsky. The postanal section of gut. Its history in Scyllium. Its disappearance. _The cloaca and anus._--The formation of the cloaca. Its junction with segmental ducts. Abdominal pockets. Anus. _The thyroid body._--Its formation in region of mandibular arch. It becomes solid. Previous investigations. _The pancreas._--Arises as diverticulum from dorsal side of duodenum. Its further growth. Formation of duct. _The liver._--Arises as ventral diverticulum of duodenum. Hepatic cylinders. Comparison with other types. _The subnotochordal rod._--Its separation from dorsal wall of alimentary canal. The section of it in the trunk. In the head. Its disappearance. Views as to its meaning.
THE VASCULAR SYSTEM AND VASCULAR GLANDS, pp. 460-478.
_The heart._--Its development. Comparison with other types. Meaning of double formation of heart. _The general circulation._ The venous system. The primitive condition of. Comparison of, with Amphioxus and Annelids. The cardinal veins. Relations of caudal vein. _The circulation of the yolk-sack._--Previous observations. Various stages. Difference of type in amniotic Vertebrates. _The vascular glands._--Suprarenal and interrenal bodies. Previous investigations. _The suprarenal bodies._--Their structure in the adult. Their development from the sympathetic ganglia. _The interrenal body._--Its structure in the adult. Its independence of suprarenal bodies. Its development.
Previous investigations. _Excretory organs and genital ducts in adult._ _In male._--Kidney and Wolffian body. Wolffian duct. Ureters. Cloaca. Seminal bladders. Rudimentary oviduct. _In female._--Wolffian duct. Ureters. Cloaca.--Segmental openings. Glandular tubuli of kidney. Malpighian bodies. Accessory Malpighian bodies. Relations of to segmental tubes. Vasa efferentia. Comparison of Scyllium with other Elasmobranchii. _Development of segmental tubes._ Their junction with segmental duct. Their division into four segments. Formation of Malpighian bodies. Connection between successive segments. Morphological interest of. _Development of Müllerian and Wolffian ducts._ _In female_--General account. Formation of oviduct as nearly solid cord. Hymen. _In male_--Rudimentary Müllerian duct.--Comparison of development of Müllerian duct in Birds and Elasmobranchii. Own researches. Urinal cloaca. _Formation of Wolffian body and kidney proper._--General account. Details of formation of ureters. _Vasa efferentia._--Views of Semper and Spengel. Difficulties of Semper's views. Unsatisfactory result of own researches. General homologies. _Résumé._ Postscript.