INDEX OF TYPES. 377 



Hydra. External characters, 335; histology, 336 ; nerve-cells, 338; pro- 

 cesses of multiplication, 339 ; development, 341. 



Liver-fluke. Summary of life history, 322 ; distoma stage, 324 ; excretory 

 system, 325 ; nervous system, 325 ; generative system, 325 ; ovum, 

 327 ; free embryo, 327 ; sporocyst, 329 ; redia, 329 ; cercaria, 330. 



Mussel. External characters, 305 ; shell, 307; alimentary system, 309; 

 respiratory system (gills), 309 ; circulatory system, 313 ; excretory 

 system, 315 ; nervous system, 317 ; special senses, 317 ; reproductive 

 system, 318 ; development, 319. 



Pigeon. External characters, 15 ; feathers, 16; apertures, 17 ; limbs, 18 ; 

 alimentary system, 47 ; respiratory system, 48 ; circulatory system, 

 49, 208; embryonic circulation, 211; urino-genital (excretory and 

 reproductive) system, 51 ; nervous system, 52 ; hind-brain, 215 ; mid- 

 brain, 218 ; fore-brain, 218 ; cranial nerves, 224 ; spinal nerves, 225 ; 

 sympathetic system, 226 ; histology of blood, 64. 



Rabbit. External characters, 11; apertures, 12; limbs, 14; hairs, 12; 

 alimentary system, 37 ; teeth, 12, 148 ; glands, 179 ; gland products, 

 181 ; digestion and absorption, 186 ; preliminary metabolism of 

 absorbed products, 188 ; further metabolism, 190 ; respiratory system, 

 39 ; circulatory system, 40, 204 ; urino-genital (excretory and repro- 

 ductive) system, 41 ; nervous system, 43 ; hind-brain, 215 ; mid-brain, 

 218 ; fore-brain, 218 ; cranial nerves, 224 ; spinal nerves, 224 ; sym- 

 pathetic system, 225 ; histology of blood, 64 ; of conjunctival epithe- 

 lium, 67; of bone, 70; of muscle, 72; of papilla foliata, 76; of 

 intestine, 79 ; of sublingual gland, 79 ; of lung, 80 ; of kidney, 81 ; 

 of hair, 83 ; of nails, 84 ; development, segmentation of the ovum, 95 ; 

 egg membranes, 96 ; establishment of the germinal layers, 101 ; forma- 

 tion of the neural or medullary tube, 102 ; foetal membranes, 108 ; 

 amnion, 108 ; allantois, 111 ; chorion, 111 ; placenta, 112. 



Snail. External characters, 291 ; apertures, 292 ; shell, 291 ; epiphragm, 

 293 ; alimentary system, 294 ; circulatory system, 295 ; respiration, 

 296 ; excretory system, 296 ; nerve system, 297 ; special senses, 298 ; 

 reproductive system, 299 ; development of pond-snail, 302. 



Paramcecium. Structure, 351 ; method of feeding, 352 ; movements, 352 ; 

 multiplication, 352. 



Tapeworm. Scolex and proglottides, 331 ; excretory system, 331 ; repro- 

 ductive system, 332 ; life history, 333. 



Vorbicella. Structure, 347 ; method of feeding, 348 ; contractile vesicle, 

 348 ; movements, 348 ; multiplication, 350. 



