338 On the Limits and Class ijicatioii of the Ganoids. 



Pi-otopteri. The table of that portion of the ichthyological 

 system with which we are here occupied will then present 

 nearly the following aspect : — 



Subclass I. Teleostei Eleutlierohranchii. 



[Osseous Fishes with free hranchia2.) 



Order I. Physoclistes or Acanthopteri (including the Acan- 

 fhopterij AnacaMhinij and Pliaryngocjnathi of Johannes 

 Miiller, groups which cannot be maintained ; and, besides 

 these, the Lojphohranchii and Plecto<jnatMj which must 

 be reduced to the rank of simple families) . 

 Order II. Physostomi or MaJacopteri. 



Suborder I. The typical Physostomi (corresponding to the 

 Physostomi of Johannes Mliller, with the addition of 

 the Amiida; and the Leptolepides^ the Megalwi^ and 

 the Caturi of the Jurassic period). 

 . Suborder II. The Gano'idei. 



Series 1. The Lepidosteidm or Eugano'idei. 

 Series 2. The Lepidopleuridoi or Pycnodontes. 

 Fam. 1. The Platysomii. 

 Fara. 2. The PJeurolepidcs. 

 Fam. 3. The true Pycnodontes. 

 Series 3. The Crossopteri or Polypteri. 

 Subseries 1. The Crossopteri Phomhiferi. 

 Fam. 1. The PoJypteri. 

 Fam. 2. The Rhondjodipteri. 

 Subseries 2. The Crossop)teri Cyclo'idei. 

 Fam. 1. The Cydodipteri. 

 Fam. 2. The Phaneropleuri. 

 Fam. 3. The Coelacanthi. 

 Suborder III. The Lepidosirens or Protopteri. 

 Suborder IV. The Sturgeons or Acipenseridce. 



Subclass II. Chondrostei Desmoh-anchii. 

 [Cartilaginous Fishes loith fixed branchiie). 



Order III. Selachii. 



Suborder 1. The Acunthodei. 



Suborder 2. The Pleuracanthii. 



Suborder 3. The ChimcBrii. 



Suborder 4. The Sharks. 



Suborder 5. The Rays. 

 Order IV. The Cyclostomi. 

 Order V. The Branchiostomi. 



IncertcB sedis. 

 Order VI. The Placodermi [Cephalaspis &c.). 



