INDEX 



Pericardium, 57, 63, 272, 293 

 Pericardio-peritoneal canal, 218 

 Perilymph, 245 

 Perinceum, 287 

 Periophthalmic sac, 94 

 Periostracum, 54 

 Peripatus, 91, 134 

 Periplaneta americana, 149, 154 



orient alis, 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 

 Phyllopodd) 99 

 Phylogeny, 282 

 Pineal body, 235, 278 

 Pituitary body, 235, 264 



fossa, 269 

 Placenta, 299 

 Placoid scales, 208 

 Platyhelmia, I 

 Pleopods, 117 

 Pleuron, 114 

 Pleura, 293 

 Pleural ganglia, 87 

 Pleurobranchke, 131, 132 

 Podical plates, 156 

 Podobranchia?, 131, 132 

 Polychczta^ 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 

 Proctodoeum, 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, 208 

 Pupa, 170 

 Pyloric ossicle, 126 



Quadrato-pterygo-palatine cartilage, 

 214 



Radula, 76, 77 

 Raid baiis, 204 



clavatd) 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 

 Scyllium canicula, 203 



cattilus, 103 

 Sebaceous glands, 285 



