554 COMPARATIVE ANATOMY AND PHYSIOLOGY. 



Perenuichordata, 87 



Perigouhnus ; figure, 37 



Peripatus ; figure, 64 ; guathites, 

 127 ; blood-vessels, 189 ; tra,- 

 chese, 215 ; nephridia, 257 ; skin, 

 299 ; appendages, 302, 377 ; ner- 

 vous system, 401 ; sensory or- 

 gans, 434, 447 ; gouads, 498 



Perissodactyla, 99 



Petroinyzon, 88 



Pholas, 80 



Physalia, 41 



Physoklisti, 92 



Physophora ; figure, 41 



Pbysostomi, 92 



Pipa ; tongue, 153 



PLiuaria, 49 



Platyhelmiuthes, 49 ; gouads, 485 



P lieu rnoder mon, 82 



Podophthalmata, 70 



Podura, 75 



Polia, 85 



Polychseta, 54 ; larva, 539 



Polynoe, 54 



Polyodon, 91 



Polyplacophora, 81 



Polypterus, 92 ; brain, 421 



Poritera, 35 



Primates, 100; limbs, 356 



Pristis ; teeth, 142 



Proueomenia ; nervous system, 

 401 ; gouads, 502 



Proteus, 93 j gill, 236 



Prototheria, 98; vertebrae, 317 



Protozoa, 25 ; digestion, 103 ; 

 parasitic, 177 ; contractile va- 

 cuoles, 247 ; phosphorescence, 

 270 ; movements, 371 ; repro- 

 duction, 473 ; skeleton, 274 



Protracheata, 65 



Pteropoda, 82 



Pycnogonoidea, 74 



Pyrophorus ; phosphorescence, 270 



Pyrosoma, 88 ; phosphorescence, 

 270 



E -bbit ; csecum, 172 ; brain, 424 ; 

 taste-bulbs, 433 ; placenta, 515 



Eadiolaria ; yellow cells, 272 ; 

 skeleton, 276 



Eatitse, 97 ; feathers, 3G8 



Eeptiles, 96 ; teeth, 145 ; salivary 

 glands, 159 ; oesophagus, 162 ; 

 intestine, 169 ; heart, 196 ; lungs, 

 239 ; respiration, 245 ; kidneys, 

 261 ; brain, 422 ; sensory organs, 

 437, 454, 467, 471 ; gouads, 512 



Ehizocephala, 69 



Rhizocrmus, 63 



Ehizopoda ; skeleton, 276 



Ehyucopygus ; anus, 121 



Eodeuts, 99 ; teeth, 150 



Eotatoria, 50 ; digestion, 118 ; re- 

 spiration, 230 ; nephridia, 251 



Euminants ; stomach, 166 ; retia, 

 209 



Sabella, 55 



Sacculina, 69 ; nutrition, 178 



Sagartia, 39 ; section of, 111 



Salamaudra, 93 ; ribs, 345 



S.tlmon ; teeth, 144 



Salpa, 88 



Sargus ; teeth, 142 



Sarsia, 40 



Sauropsida, 95 ; uric acid, 265 ; 

 vertebral column, 314, 321 ; 

 skull, 331 



Scaphopoda, 82 



Scar us ; teeth, 142 



Scorpion ; guathites, 127 ; month-, 

 179 ; lung-books, pectiues, 226 ; 

 poison, 266 



Sea-gall ; gizzard, 176 



Selachoidei, 91 



Sepia, 83 



Serpula, 55 



Siuupalliata, 80 



Siphonophora, 41 



Sirenia, 99 ; respiration, 243; ver- 

 tebrae, 317 ; limbs, 353 



Snakes ; teeth, 146 ; arterial ar- 

 ches, 205 



Solen, 80 ; haemoglobin, 212 



Spitangidse, 63 



Spider; poison glands, 265; silk 

 organs, 267 



Sponge, 31 ; digestion, 106 ; re- 

 spiration, 211; nitrogenous 

 waste, 248 ; skeleton, 278 ; sense - 

 cells, 431 ; gouads, 483 



Squatina ; heart, 196 



Squilla ; figure, 69 ; testis, 498 



Steatornis ; syrinx, 391 



Stegauophthalinata, 42 



Stenostomata, 96 



Stentor, 30 ; stentorin, 272 



Strepsiptera, 77 



Streptoneura, 81 



Stylasteridge ; dactylozooids, 109 



Suctoria, 31 ; digestion in, 104 



Sun-birds ; tongue, 156 



Sycon, 36 



Synapta, 64 ; spicules, 296 



Tsenia, 49 ; digestion in, 177 ; 

 plasmatic canals, 185 ; develop- 

 ment, 545 



