Diverticulum caecum vitelli in birds, 35 in _Urinator imber_, 35 _lumme_, 35 vateri, 114 Dog, biliary ducts in, 145 Dorsal mesentery, early condition and derivation, 32 in lower vertebrates, 32 smooth muscular fiber of, 33 mesogastrium, area of adhesion to parietal peritoneum, 106 developmental changes in direction and extent, 103 definition of, 100, 101 gastro-splenic segment, 108 redundant omental growth, 105 spleen and pancreas in cat, 126 vertebro-splenic segment, 108 vascular ileo-caecal fold, 262 fold, influence on shape of appendix, 271 Double caecal pouches of birds, 203 Ducts of Cuvier, 147 in Selachian, 155 in Urodele amphibian, 156 omphalo-mesenteric, 22 of Santorini, 111 vitello-intestinal, 22 of Wirsung, 111 development of, 112 Ductus venosus, 149 changes after birth in, 152 Duodenal antrum, 194 fold of cat, 92 of _Hapale vulgaris_, 93 inferior, 95 of _Nasua rufa_, 92 superior, 95 fossae, 92 superior, 94 vascular relations, 95, 96 loop, 54 Duodeno-colic neck, 57 Duodeno-jejunal fossa in the cat, 93 Duodenum, adhesion of, 67 development of, 53 peritoneal relations of infra-colic segment, 81 of supra-colic segment, 81 suspensory muscle of, 33 with biliary and pancreatic ducts, of _Casuarius_, 115 _Echidna hystrix_, ileo-colic junction and caecum of, 204 _Echelus conger_, alimentary canal of, 54 ileo-colic junction of, 200 intestinal mucosa of, 197 endgut of, 199 pyloric appendix of, 120 Ectoderm, 21 Edentata, ileo-colic junction of, 206 types of ileo-colic junction and caecum in, 218 Egg, development of, 20 structure of, 19 Elasmobranchs, development of liver in, 143 _Elephas indicus_, ileo-colic junction and caecum of, 210 Embryonal intestinal hernia, 52 Embryonic shield, 20 Embryo, separation of, 20 Endgut of _Echelus_, 199 extent and contained segments, 38 function of, 198 in lower vertebrates, 199 Enteric canal, primitive condition of, 29 Entoderm, 21 derivatives of, 28 Entodermal intestinal tube, derivatives of, 34 Epiblast, 21 Epiploic bursa, 107 early stages of, 104 Epithelium of alimentary canal, derivation of, 30 _Erethizon dorsatus_, ileo-colic junction and caecum of, 211 _Esox_, alimentary canal of, 40 _Eunectes marinus_, ileo-colic junction and caecum of, 203 External iliac artery, 63 perineal folds, 28 Foetus at term, venous system of, 162 Falciform ligament, as part of ventral mesogastrium, 165 _Felis_, ileo-colic junction and caecum of, 212 _leo_, ileo-colic junction and caecum of, 212 Fish, development of pancreas, 115 folds of intestine, 196 ileo-colic junction of, 200 Fissipedia, ileo-colic junction of, 212 Fissure, transverse anal, 27