Cloaca, development of, 24 division of, in higher vertebrates, 27 in human embryos, 26 in _Platypus anatinus_, 26 structure of, in lower vertebrates, 25 in _Iguana tuberculata_, 25 Cloacal membrane, 24 anal segment, 28 uro-genital segment, 28 Coeliac axis, 65 Coelom, composition and derivation of walls, 29 development of, 21 primitive condition of, 29 Colic bend of the Manidae, 234 loop in _Phascolarctos_, 234 Colico-phrenic ligament, 109 Colon, ascending, adhesions of, 81 position of, in foetus, 84 and caecum of _Lagomys pusillus_, 232 descending, adhesion of, 81 relation of, to left kidney, 83 position as influenced by foetal liver, 77 spiral coil of, 233 structural modifications of, 230 _Coluber natrix_, stomach of, 44 Common bile duct, 145 Comparative anatomy of hepatic venous circulation, 154 of liver, 144 Comparison of human and anthropoid caeca, 247 Connective tissue and muscular fibers, derivation of, 30 Coprodaeum, 25 Coronary artery, 181 ligaments of liver, 173 _Corvus_, caeca of, 203 Costo-colic ligament, 109 Crocodiles, stomach of, 46, 51 Crop, 48 _Cryptobranchus alleghaniensis_, ileo-colic junction of, 201 Cyclostomata, divisions of alimentary canal of, 40, 42 intestinal canal of, 191 spiral intestinal valve of, 119 _Cyclothurus didactylus_, ileo-colic junction and caeca of, 207 _Cyclura teres_, ileo-colic junction and caecum of, 202 _Cynocephalus anubis_, ileo-colic junction and caecum of, 214 _babuin_, ileo-colic junction and caecum of, 214 _porcarius_, ileo-colic junction and caecum of, 214 _sphinx_, ileo-colic junction and caecum of, 214 Cynoidea, ileo-colic junction of, 212 Cynomorpha, ileo-colic junction of, 213 _Cyprini_, stomach of, 44 Cystic duct, 146 development of, 142 Cysto-enteric duct, 145 _Dasyprocta agouti_, ileo-colic junction and caecum of, 211 spiral colon of, 234 _Dasypus sexcinctus_, ileo-colic junction and caeca of, 207 _Dasyurus viverinus_, ileo-colic junction of, 206 Descent of caecum, 243 Derivatives of entodermal intestinal tube, 34 Deuteroplasm, 19 Development of caecum and appendix, 237 of cystic duct, 142 of gall-bladder, 142 of liver, 141 in amniota, 143 in chick, 143 in Elasmobranchs, 143 in Teleosts, 143 of portal circulation, 147 of spiral colon, 233 of transverse colon, 244 of vascular system of liver, 145 _Dicotyles_, caecal gastric appendices of, 48 _torquatus_, ileo-colic junction and caecum of, 209 _Didelphis_, ileo-caecal folds of, 263 _virginiana_, ileo-colic junction and caecum of, 205 Digitiform gland of Selachians, 201 Dipnoeans, intestinal canal of, 191 spiral intestinal valve in, 119