LANCELET. OK AMPHIOXUS. 281 



FIG. 352. 



Lancelet or Amphioxus, Branchiosloma. 



skeleton, no proper head, and only a mere longitudinal 

 slit for the mouth, which is wholly destitute of jaws and 

 teeth. 



PRINCIPAL TOPICS CONSIDERED IN CHAPTER II., SECTION VI. 



SUB-SECTION I. 



Fishes considered as a Class. Their general structure and functions. Classi- 

 fication. 



SUB-SECTION II. 

 Plagiostomi or Selachii. -Rays or Skates. Saw-fishes. Sharks. 



SUB-SECTION III. 

 Holocephali or Chimteras. Their structure and where found. 



SUB-SECTION IV. 



Protopteri or Lepidosirens. Origin and meaning of the name. Structure, 



eize, and where found. 



SUB-SECTION V. 

 Ganoidei. Gar-pikes. Sturgeons. Fossil Ganoids. 



SUB-SECTION VI. 

 Lophobrauchii. Origin of the name. Pipe-fishes. Sea-horses. 



SUB-SECTION VII. 



Plectognathi. Puffers. Sun-fishes. Trunk-fishes. 



SUB-SECTION VIII. 



Acanthopteri or Spine-firmed fishes. Toad-fishes, etc. Lnmp-fishes. Dol- 

 phins. Eel-pouts. Sword-fishes. Mackerels. Pilot-fishes, etc. Mullets. 



Chtetodonts. Porgees. - Weak-fishes. Sculpins, etc. Perch. 



Breams. Bass. Star-gazers. 



SUB-SECTION IX. 

 Anacanthi. Cods, etc. Remora. Flounders, Halibuts, etc. 



SUB-SECTION X. 



Pharyngognathi. Tautogs. Gars. Flying-fishes. 



SUB-SECTION XI. 



Malacopt.eri. Cat-fish, etc. Carp, etc. Pike, etc. Trout and Salmon. 



Shad, etc. Blind-fish. Eels. 



SUB-SECTION XII. 

 Dermopteri. Lamprey?. Hags or Myxines. Amphioxus or Lancelet. 



For the most recent Classification of Fishes see Dr. Theodore Gill's "Arrange- 

 ment of the Families of Fishes." Smithsonian Miscellaneous Collections. 



