Index. 



199 



Muscles of eyeball, 152. 



Of fish, 78. 



Of fish eye, 79. 



Of grasshopper, 14. 



Of larynx, 157, 158. 



Of pigeon, 116. 



Of starfish, 182. 

 Myriapoda, 30, 31, 32. 



Nectar, 24. 



Nephridia, 52. 



Nerve collar, 52. 



Nerve cord of crayfish, 44. 



Of earthworm, 52. 



Of grasshopper, 15. 



Of starfish, 180. 

 Nerve, optic, 153. 



Ring, of earthworm, 52. 



Ring, of starfish, 180. 



Sciatic, of frog, 89. 



Vagus, offish, 75. 



Vagus, of pigeon, 116. 

 Nerve-muscle preparation, 90. 

 Nerves, auditory, 150. 



Cranial, 149. 



Facial, 150. 



Hypoglossal, 150. 



Of crayfish, 44. 



Olfactory, of frog, 88. 



Optic, of fish, 79. 



Optic, of frog, 88. 



Spinal, of frog, 89. 



Spinal, of rabbit, 147. 

 Nervous system of clam, 61. 



Of frog, 88. 



Of grasshopper, 15. 



Of rabbit, 146. 

 Nesting of birds, 105. 

 Net, insect, 2. 

 Neural arch, 78. 



Spine, 78. 

 Nostrils of birds, 109. 



Of fish, 72. 

 Nucleus, 163. 

 Nymph, 18. 

 Nymphalidae, 19. 



Observation hive, 25. 

 Ocelli, 10. 

 Ocular plates, 187. 



Odonata, 18. 

 Odontoid process, 161. 

 Oil gland of birds, no. 

 Olfactory lobes of fish, 79. 



Nerve of frog, 88. 



Nerve of mammal, 148, 149. 

 Olfactory nerve of frog, 88. 

 Opercle of fish, 72. 

 Operculum of snail, 65. 

 Optic lobes of fish, 79. 



Of frog, 88. 



Nerve of fish, 79. 



Nerve of frog, 88. 



Nerve of mammal, 1^9, 153. 

 Oral groove of paramecium, 165. 



Pole of sea urchin, 185. 



Surface of sea urchin, 187. 



Surface of starfish, 178. 

 Orbit of eye, 159. 

 Order, 19. 



Origin of muscle, 90, 151. 

 Orthoptera, 17. 

 Otolith, 80. 

 Ovary of crayfish, 43. 



Of earthworm, 52. 



Of fish, 75. 



Of frog, 87. 



Of hydra, 173. 



Of pigeon, 119. 



Of sea urchin, 188. 



Of snake, 99. 



Of starfish, 181. 



Of turtle, 102. 

 Oviduct of crayfish, 43. 



Of earthworm, 50. 



Of fish, 75. 



Of frog, 87. 



Of grasshopper, 14. 



Of pigeon, 119. 



Of snake, 99. 

 Oviparous animals, 122. 

 Ovipositor of cricket, 17. 



Of dragon fly, 18. 



Of grasshopper, 13. 

 Ovoviviparous animals, 122. 



Paired fins, 71. 

 Palate of rabbit, 144. 

 Palatine bones, 71. 

 Palps of butterfly, 19. 



