INDEX. 



AMPHIOXUS : segmentation of ovum, 5 ; 

 development of body-cavity, 9 ; inte- 

 gument, 17 ; notochord, 34, 38 ; spinal 

 cord, 136 ; mouth, 212 ; thyroid, 225 ; 

 alimentary canal, 228, 237/239 ; gills, 

 246 ; blood-corpuscles, 268 ; generative 

 organs, 310 



CYCLOSTOMES : segmentation of ovum, 5 ; 

 integument, 17 ; vertebral column, 34, 

 38 ; skull, 63 ; branchial basket, 64, 118 ; 

 brain, 136 ; cranial nerves, 153 ; olfactory 

 organ, 171 ; eye, 184 ; semicircular canals, 

 196 ; mouth, 212 ; horny teeth, 214 ; 

 thyroid, 225 ; alimentary canal, 228 ; 

 alimentary epithelium, 237, 239 ; liver, 

 240 ; pancreas, 243 ; gills, 246 ; ab- 

 dominal pores, 265 ; blood-corpuscles, 

 268 ; heart, 277 ; urinogenital organs, 

 300, 302, 310 



FISHES : integument, 16 ; dermal skeleton, 

 30 ; vertebral column, 34 ; ribs, 48 ; 

 skull, 63 ; unpaired fins, 85 ; paired fins, 

 86 ; pectoral arch, 87 ; pelvic arch, 92 ; 

 free limbs, 99 ; dermal muscles, 113 ; 

 muscles of the trunk, 113 ; muscles of 

 the visceral skeleton and head, 118 ; 

 muscles of the appendages, 121 ; electric 

 organs, 124 ; spinal cord, 131 ; brain, 

 134, 136 ; spinal nerves, 152 ; cranial 

 nerves, 153 ; suprarenal bodies, 161 ; 

 sense-organs of the integument, 163 ; 

 olfactory organ, 171 ; eye, 184 ; retina, 

 189 ; eye-muscles and eyelids, 191 ; 

 auditory organ, 198, 205 ; relations of 

 auditory organ with air-bladder, 207 ; 

 teeth, 214 ; tongue, 222 ; thyroid, 225 ; 

 thvmus, 226 ; alimentary canal, 228 ; 

 liver, 242 ; pancreas, 243 ; gills, 246, 

 248 ; air-bladder, 251 ; abdominal pores, 

 265 ; blood-vessels, 270 ; heart and its 

 vessels, 277 ; arterial system, 288 ; 

 venous system, 291 ; retia mirabilia, 292 ; 

 lymphatic system, 292 ; spleen, 294 ; 

 urinary organs, 296, 302 ; generative 

 organs, 300, 310 ; claspers, 327 



DIPNOAXS: integument, 17; dermal 

 skeleton, 30 ; vertebral column, 35, 38 ; 



ribs, 48 ; skull, 66 ; pectoral arch, 87 ; 

 pelvic arch, 92 ; free limbs, 99 ; muscles 

 of the trunk, 116 ; muscles of the ap- 

 pendages, 121 ; brain, 142 ; cranial 

 nerves, 153 ; sense-organs of the integu- 

 ment, 163 ; olfactory organ, 172 ; lips, 

 212 ; tongue, 222 ; alimentary canal, 

 228 ; alimentary epithelium, 239 ; gills, 

 246, 250 ; laryngo-tracheal chamber, 

 253 ; lungs, 257 ; abdominal pores, 265 ; 

 heart and its vessels, 280 ; urinary 

 organs, 302 ; generative organs, 314 



AMPHIBIANS : segmentation of the ovum, 

 5 ; integument, 17, 18 ; dermal skeleton, 

 19, 32 ; vertebral column, 39 ; ribs, 48 ; 

 sternum, 51 ; skull, 70 ; pectoral arch, 

 87 ; pelvic arch, 92 ; free limbs, 104 ; 

 muscles of the trunk, 113 ; muscles of 

 the visceral skeleton and head, 119 ; 

 muscles of the appendages, 121 ; " dia- 

 phragm," 122 ; spinal cord, 131 ; brain, 

 134, 142 ; spinal nerves, 152 ; cranial 

 nerves, 153 ; suprarenal bodies, 161 ; 

 sense-organs of the integument, 163 ; 

 tactile cells, 167 ; olfactory organ, 172 ; 

 spouting apparatus of Gymnophiona, 

 179 ; eye, 186 ; retina, 189 ; eye-muscles 

 and eyelids, 191 ; glands of the eye, 

 192 ; auditory organ, 198, 205 ; teeth, 

 214 ; glands of the mouth, 221 ; tongue, 

 222 ; thyroid, 225 ; thymus, 226 ; ali- 

 mentary canal, 228 ; liver, 241 ; pancreas, 

 243 ; gills, 246, 250 ; air-passages, 253 ; 

 lungs, 257 ; blood-corpuscles, 268 ; al- 

 lantois, 273 ; heart and its vessels, 281 ; 

 arterial system, 288 ; venous system, 

 291 ; lymphatic system, 292 ; spleen, 

 294 ; urinary organs, 296, 304 ; genera- 

 tive organs, 310 ; copulatory organs, 328 



REPTILES : integument, 20 ; dermal 

 skeleton, 32 ; vertebral column, 42 ; 

 ribs, 49 ; sternum, 51 ; skull, 74 ; pec- 

 toral arch, 87 ; pelvic arch, 94 ; free 

 limbs, 105 ; muscles of trunk, 116 ; 

 muscles of the visceral skeleton and 

 head, 120 ; muscles of the appendages, 

 121; "diaphragm," 122; brain, 132, 

 134, 144 ; spinal nerves, 152 ; cranial 



