_Amphioxus_, alimentary canal of, 42 hepatic diverticulum of, 43 intestinal canal of, 191 Anthropoid apes, ileo-caecal folds of, 274 Anthropoidea, ileo-colic junction of, 213 Anthropomorpha, ileo-colic junction of, 216 _Anguilla anguilla_, stomach of, 47 Anure Amphibian, abdominal vein of, 158 cardiac vein in, 158 musculo-cutaneous vein in, 158 pelvic vein in, 158 post-cava in, 158 pre-cava in, 158 venous system in, 158 Aorta, early condition of intestinal branches, 32 Aortal arterial system, development of, 63 Aplacentalia, definition of, 36 Appendix, abnormal positions of, 277 absence of, 249 influence of dorsal vascular fold on shape of, 271 origin of, and shape of caecum, 245 position and peritoneal relations of, 250 variations of peritoneal relations, 258 Arctoidea, ileo-colic junction of, 212 _Arctopithecus marmoratus_, ileo-colic junction of, 208 Arctopithecini, ileo-colic junction of, 214 Arrest of development before intestinal rotation, 60 Arteries, of allantois, 64, 146 Artery, caudal, 64 ileo-colica, 66 colica dextra, 66 media, 66 coronary, 181 external iliac, 64 gastro-epiploica sinistra, 108 hepatic, 65, 179 ileo-colic, 262 inferior mesenteric, 67 internal iliac, 64 pancreatico-duodenalis inferior, 66 omphalo-mesenteric, 64, 146 sacralis media, 64 splenic, 65, 108 superior mesenteric, 64, 65 umbilical, 64 vitelline, 64, 146 Artiodactyla, ileo-colic junction of, 209 _Arvicola pennsylvanicus_, ileo-colic junction and caecum of, 211 Asymmetrical type of ileo-colic junction, 223 _Ateles_, ileo-caecal folds of, 261 _ater_, ileo-colic junction and caecum of, 214 Atresia ani, 24, 28 Axial mesoderm, connection with splanchnic and somatic mesoderm, 22 _Bassaris astuta_, ileo-colic junction of, 212 Batrachians, stomach of, 44, 46 _Belone_, alimentary canal of, 40 Biliary ducts in _Accipenser_, 145 in Amphibians, 145 arrangement of, 145 in birds, 145 in _Buceros_, 145 in calf, 145 in dog, 145 in _Galeopithecus_, 145 in _Lophius_, 145 in _Lutra_, 145 in Monotremes, 145 in _Phoca_, 145 in Reptilia, 145 in sheep, 145 in _Tarsius_, 145 in _Trigla_, 145 in _Xiphias_, 145 Birds, folds of intestine in, 196 glandular stomach of, 50 biliary ducts in, 145 ileo-colic junction of, 203 muscular stomach of, 50 venous system of, 161 Blastoderm, 20 layers of, 21 primitive, 20 Blastodermic vesicle, 20 Blastomeres, 20 Blastula, 20 Blastosphere, 20 Body-cavity, development of, 21 primitive condition of, 29 Body-wall, 22 _Boselaphus tragocamelus_, ileo-colic junction and caecum of, 210 _Bos indicus_, ileo-colic junction and caecum of, 210 spiral colon of, 233