CONTENTS. 



LECTURE VTI. 



Myology of Fislies, p. 163. General Disposition of their muscular System seg- 

 mental, corresponding with the Vertebrae, p. 163 Special Description of the 

 segments, or ' Myocommata,' p. 164. Modified Myocommata of the Head, 

 p. 165. Muscles of Torpedo, p. 167. Muscles of the Pectoral Fins, p. 167. ; 

 of the Ventral Fins, p. 168.; of the Vertebral Fins, p. 168. Characters of the 

 Myonine in Fishes, p. 169.; Crimping, p. 169. Action of the Muscles of 

 Fishes in swimming, leaping, flying, and wielding their various Weapons, p. 170. 



LECTURE VIII. 



Neurology of Fishes, p. 171. Simple neural axis of Lancelet, p, 171. Natural 

 Division of neural axis into ' Brain' and ' Myelon ' in other Fishes, p. 1 72. Cha- 

 racters of Myelon or ' Medulla Spinalis,' p. 172. Myelonal Ganglia and Canal, 

 p. 173. ' Macromyelon' or Medulla Oblongata, p. 174. Cerebellum, p. 175. 

 Mesencephalon, p. 177 Optic Lobes, p. 177. Hypoaria, p. 178. Hypophysis, 

 p. 179. Conarium, p. 179. Prosencephalon, p. 180. Rhinencephalon, p. 182. 

 Distinction between Rhinencephalic Crura and Olfactory Nerves, p. 183. Ho- 

 mology of Prosencephalon, p. 184. Physiology of the Vagal Lcbes, p. 185. ; 

 of the Cerebellum, p. 186 ; of the Optic Lobes, p. 187. ; of the Prosence- 

 phalon, p. 188. Membranes of the Neural Axis, p. 188. ; Olfactory Nerves, 

 p. 189. Optic Nerves, p. 190. Oculo-Motorius, p. 191. Trochlearis, p, 193. 

 Abducent, p. 193. Trigeminal, p. 193. Facial, p. 195. Acoustic, p. 195. 

 Vagus, p. 195. Spinal Nerves, p. 197. Sympathetic, p. 198. Organs of 

 Smell, p. 199. Organ of Sight, p. 202. Organ of Hearing, p. 207. Its Con- 

 nection with the Air- Bladder, p. 210. Electric Organs in Torpedo, p. 212.; in 

 Gymnotus, p. 213. Experiments on, by Matteucci, p. 215. ; and Faraday, p. 216. 

 Baron Humboldt's Account of the capture of Gymnoti, p. 216. Analogies of 

 Action of Electric Organs to that of voluntary Muscle, p. 217. Muciferous 

 Nerves, p. 218. Follicular Nerves, p. 218. 



LECTURE IX. 



Digestive Systein of Fishes, p. 219. The Teeth, p. 219. : their Number, p. 219. ; 

 Form, p. 219. ; Situation, p. 221. ; Attachment, p. 222. ; Substance, p. 224. ; 

 Chemical Composition, p. 225. ; Structure, p. 226. ; Development, and Re- 

 production, p. 227. The Mouth, p. 228. ; anterior and posterior Jaws, 

 p. 229. Quasi- Salivary Glands, p. 230. ; Irritable Palate of Cyprinoids, p. 

 230. ffisophagus, p. 232. Stomach, p. 233. Regurgitation and Rumination 

 of Fishes, p. 236. Peritoneum, its outlets, p. 231. ; Intestines, small, p. 237. ; 

 large, p. 238. Spiral Valve, p. 239. ; its final purpose in Sharks, p. 240. 

 Relative position of Anus characteristic of Fishes, p. 240. Mesogastry and 

 Mesentery, p. 241. Variable Situation of Cloacal Outlet, p. 241. ' Cop- 

 rolites,' p. 241. Liver, p. 241. Gall-bladder, p. 243. Gall-ducts, p. 244. 

 Pancreas, p. 244. In what Fishes it is absent, and why, p. 244. ; its progressive 

 Development in Fishes, p. 245. 



