338 On the Limits and Classification of the Ganoids. 



Protopteri. Tlie table of that portion of the ichthyological 

 system with which we are here occupied will then present 

 nearly the following aspect : — 



Subclass I. Teleostei Eleutheroliranchu. 



[Osseous Fishes tuithfree hrancMce.) 



Order I. Physoclistes or Acanthopteri (including the Acan- 

 thopterij Anacanthini, and Pharyngognathi of Johannes 

 Miiller, groups which cannot be maintained j and, besides 

 these, the Lophohranchii and Plectognathi^ which must 

 be reduced to the rank of simple famibes). 

 Order II. Physostomi or Malacopteri. 



Suborder I. The t}^ical Physostomi (con-esponding to the 

 Physostomi of Johannes Miiller, with the addition of 

 the Amiidce and the Leptolepides^ the Megaluri^ and 

 the Caturi of the Jurassic period). 

 Suborder II. The Gano'idei. 



Series 1. The Lepidosteidce or Eugano'idei. 

 Series 2. The Lepidophurid<e or Pycnodontes. 

 Fam. 1. The Platysomii. 

 Fam. 2. The Pleurolepidea. 

 Fam. 3. The true Pycnodontes. 

 Series 3. The Grossojjteri or Polypteri. 

 Subseries 1. The GrossopteriUhomhiferi. 

 Fam. 1. The Polypteri. 

 Fam. 2. The Rhomhodipteri. 

 Subseries 2. The Grossopteri Gyclo'idei. 

 Fam. 1. The CyclodipAeri. 

 Fam. 2. The Phaneropleuri. 

 Fam. 3. The Goelacanthi. 

 Suborder III. The Lepidosirens or Protopteri. 

 Suborder IV. The Sturgeons or Acipenseridce. 



Subclass II. Ghondrostei Desmohranchii. 

 {Cartilaginous Fishes loith fixed hranchice). 



Order III. Selachii. 



Suborder 1. The Acanthodei. 



Suborder 2. The Pleuracanthii. 



Suborder 3. The Ghimoirii. 



Suborder 4. The Sharks. 



Suborder 5. The Rays. 

 Order IV. The GycJostomi. 

 Order V. The Branchiostomi. 



Incertce sedis. 

 Order VI. The Placodermi {Gephalaspis &c.). 



