INDEX 



Pericardium, 57, 63, 272, 293 

 Pericardio-peritoneal canal, 218 

 Perilymph, 245 

 Perinceum, 287 

 Periophthalmic sac, 94 

 Periostracum, 54 

 Peri pat US) 91, 134 

 Periplaneta americana, 149, 154 



orient alls, 156, 157 

 Peristome, 70 



Peritoneal funnels, 42, 51, 134, 187 

 Peri visceral sinus, 131 

 Pharyngeal bands, 178 

 Pharyngobranchial cartilages, 215 

 Pharynx, 21, 177 

 Phyllites, 96 

 Phyllopoda, 99 

 Phylogeny, 282 

 Pineal body, 235, 278 

 Pituitary body, 235, 264 



fossa, 269 

 Placenta, 299 

 Placoid scales, 208 

 Platyhelinici) I 

 Pleopods, 117 

 Pleuron, 1 14 

 Pleura, 293 

 Pleural ganglia, 87 

 Pleurobranchke, 131, 132 

 Podical plates, 156 

 Podobranchke, 131, 132 

 Polyckatct) 48 

 PolygordiuS) 45, 46 

 Post-trematic nerve, 241 

 Premolar teeth, 287 

 Pre-oral cavities, 196 

 Prepyloric ossicle, 126 

 Presphenoid, 290 

 Prespiracular liagment, 215 

 Pre-trematic nerve, 241 

 Primary gill-bars, 178 

 Primitive hypoblast, 192 



streak, 140, 301 

 Prismatic layer of shell, 54 

 Proctodseum, 101, 145, 158, 264 

 Proglottides, 2 

 Pronephridia, 48 

 Pronephros, 230, 275, 277 

 Pronotum, 154 



Propodite, 120 

 Propterygium, 216 



Prostomium, 17, 19, 43, 45, 48, 51, 



108, 171 

 Prothorax, 154 

 Protopodite, 117 

 Prototheria, 289, 292, 298 

 Proventriculus, 23, 124, 147, 158 

 Pseudobranch, 220 

 Pterocardiac ossicle, 126 

 Pulmocutaneous artery, 275 

 Pulmonary chamber of snail, 72, 73 

 Pulmonary veins, 273 

 Pulp, 208 

 Pulp cavity, 2p8 

 Pupa, 170 

 Pyloric ossicle, 126 



Quadrato-pterygo-palatine cartilage, 

 214 



Radula, 76, 77 

 Raia batis, 204 



clavata,) 204 

 Receptaculum ovorum, 33 

 Rectal gland, 220 

 Recti muscles of eye, 238, 242 

 Rectum, 158 

 Redia, 12 



Renal portal system, 229, 272 

 Renopericardial canal, 73 

 Reproductive organs, 106, 162 

 Restiform bodies, 236 

 Rete mirabile, 275 

 Retina, 279, 280 

 Retinula, 137 

 Rhabdom, 137, 139 

 Rhabdomere, 139 

 Rostrum, 114 

 Rotation, of frog's egg, 252 



Sacci vasculosi, 235 

 Sacculus, 245 

 Sacral vertebrae, 289 

 Scales, of Distomum, 7 

 Scaphognathite, 122, 131 

 Scapula, 216 

 Sclerotic, 280 

 Sclerotome, 199 

 Scy Ilium canicula, 203 



eatulwS) 103 



Sebaceous glands, 285 



