INDEX. 



A. 



Aberrant divisions, an independ- 

 ent circle formed by, i. 10. 



Acanthicus, characters of, i. 336. 



Acanthopteryges, general charac- 

 ters of, i. 100. ii. 1. Geographical 

 distribution of, 6. Prinaary divi- 

 sions of, 6.. 



Achrochordus, ii. lH. 



Adhesive fishes, singular form and 

 use of the ventrals in, i. 21. 



.Sltobates described, i. 176. 



Agassiz, character of his work on 

 the fishes of Brazil, i. 67. 



Agamidffi, general characters of, ii. 

 160. 



Ageniosus, characters of, i. 345. 



Agonidffl, general characters of, ii. 

 53. 



Agriopus, characters of, ii. 57. 



Air bladder, situation and use, i. 13. 



Alligator tortoise figured and de- 

 scribed, ii. 116. 



Amphibia, general description of, 

 ii. 83. Primary divisions of, 85. 

 True, 94. 



Amphisbfenidce, general characters 

 of, ii. 140. 



Amphisile scutatus figured, ii. 43. 



Anableps, characters of, i. 363. 



Anal fin described, i. 29. 



Analogies, observations on the na- 

 ture of, in general, i. 111. 



Analogies of the : — 

 Locomotive organs of Birds with 



the fins of Fishes, i. 37. 

 Primary divisions of Fishes with 

 warm-blooded vertebrata, i. 

 109. 

 Primary divisions of Fishes and 

 those of the Annulosa, i. 113. 

 And of the Reptiles, 115. 

 Fishes and the other classes of 



the animal world, i. 117. 

 Families of Cartilagines and the 

 ordersof Fishes, i. 149. And the 

 Vertebrata, 154. And Birds,] 57. 



Analogies — eontinued. 



Sub-families of the Squalida?, and 

 the families of Cartilagines, i. 

 159. 



Squalinffi and Centrince, i. 162. 



Rays and the Cartilaginous fami- 

 lies, i. 187. 



TrygoninEe and Raidse, i, 188. 



Cheloniform fishes and the pri- 

 mary orders, i. 200. And the 

 primary orders of Quadrupeds 

 and Birds, I'Ol. 



Syngnathida?, i. 207. 



Plectognathes and the orders of 

 fishes, i. 210. 



Plectognathes and the Cartila- 

 gines, i. 211. 



Plectognathes and the Malacop- 

 teryges, i. 212. 



Apodal order, i. 216. 



Malacopter) ges and the orders of 

 Fishes, i. 232. 



Malacopteryges and the Carti- 

 lagines, i. 234. 



Malacopteryges and the Cheloni- 

 form fishes, i. 235. 



Sub-genera of Salmo and the or- 

 ders of Fishes, i. 249. 



Sub-genera of Salmo and the sub- 

 families of Salmonidee, i. 251. 



Salmon, i. 256. 



European and American salmon, 

 i. 259. 



Primary divisions of the Salmo- 

 nidse with the genera of Salmo 

 and Characinus, i. 263. 



Genera of the salmon with the 

 sub-families of the Salmonids, 

 i. 263. 



Sub-genera ofClupea to the ge- 

 nera of Clupeina>^ i. 279. 



Sub-genera of Clupea to those 

 of Elop§, i. 285. 



Clupeinffi and the Salmonidae, i. 

 292. 



Sub- families of the Salmonidee 

 and the types of the Scombe- 

 ridee, i. 306. 



