Peritoneum, arrangement in infra-colic compartment, 78 of cat, compared with human arrangement, 73 of infra-colic compartment in adult human subject, 88 lesser cavity of, in relation to liver, 174 of liver, in relation to lesser sac, 174 secondary lines of reflection, 73 of supra-colic compartment, general considerations, 99 _Petromyzon_, alimentary canal of, 200 liver of, 141 spiral intestinal valve of, 119 Peyer's patches, 196 _Phascolarctos cinereus_, ileo-colic junction and caecum of, 205 colic loop in, 234 _Phascolomys wombat_, ileo-colic junction, caecum and appendix of, 206 _Pteropus medius_, ileo-colic junction of, 212 _Phoca_, biliary ducts in, 145 _vitulina_, ileo-colic junction and caecum of, 212 stomach of, 45 _Phocaena communis_, ileo-colic junction of, 209 intestinal folds, 196 Phylogeny of types of ileo-colic junction and caecum, 217 _Physeter_, ileo-colic junction of, 209 Physiology of vertebrate intestine, 190 Pickerel, pyloric valve of, 45 stomach of, 44 Pinnipedia, ileo-colic junction of, 212 _Pipa_, stomach of, 46 Piscivorous divers, caeca of, 203 _Pithecia satanas_, ileo-colic junction and caecum of, 215 Placental circulation, 146 Placentalia, definition of, 36 Plates, medullary, 21, 28 _Platypus anatinus_, male genito-urinary tract and cloaca, 26 _Pleuronectes maculatus_, ileo-colic junction of, 201 pyloric appendices in, 120 Pleuro-peritoneal cavity, 28 Plicae coli, 199 _Polypterus_, pyloric appendix in, 120 Portal circulation, development of, 147 vein, development of, 148 Position and peritoneal relations of appendix, 250 Post-anal gut, 23 Post-cardinal veins in Urodele Amphibian, 157 Post-cava in Anure Amphibian, 158 in _Iguana_, 159 in Urodele Amphibian, 157 Post-caval vein, 151 Pre-cava in Anure Amphibian, 158 Primates, ileo-colic junction of, 213 types of ileo-caecal folds in, 265 Primitive aortae, 63 common dorsal mesentery, 33 dorsal mesentery after rotation, 79 mesentery, effect of intestinal rotation on, 59 mesenteric segment, 72 mesocolic segment, 72 jugular veins, 147 Proboscidea, ileo-colic junction of, 210 Proctodaeum, 24, 26 in human embryos, 27 Protoplasm, 19 _Protopterus_, pancreas in, 117 _Proteus_, alimentary canal of, 40 _anguineus_, stomach of, 43 _Proteles lalandii_, ileo-colic junction and caecum of, 212 Proventriculus, 50 Psalterium, 49 _Pseudemys elegans_, alimentary canal of, 55 ileo-colic junction and caecum of, 201