INDEX 



319 



Pericardium, 57, 63, 272, 293 

 Pericardio-peritoneal canal, 218 

 Perilymph, 245 

 Perinssum, 287 

 Periophthalmic sac, 94 

 Periostracum, 54 

 Peripatus, 91, 134 

 Periplaneta americana, 149, 154 



orientalis, 156, 157 



Peristome, 70 



Peritoneal funnels, 42, 51, 134, 187 



Perivisceral sinus, 131 



Pharyngeal bands, 17S 



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 

 Platyhelmia, I 



Pleopods, 117 



Pleuron, 1 14 



Pleura, 293 



Pleural ganglia, 87 



Pleurobranchiae, 131, 132 



Podical plates, 156 



Podobranchiae, 131, 132 



Polychata, 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, S4 



Proctodseum, loi, 145, 158, 264 



Proglottides, 2 



Pronephridia, 48 



Pronephros, 230, 275, 277 



Pronotum, 154 



Propodite, 120 



Propterygium, 216 



Prostomiura, 17, 19, 43, 45, 48, 51, 



lo8, 171 

 Prothorax, 154 

 Protopodite, 117 

 Prototheria, 289, 292, 29S 

 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 

 Rdia bails, 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 prgans, 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 

 Scyllhim canicula, 203 



catiilus, 103 



Sebaceous glands, 285 



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