These are arranged according to the classification of Dr. Günther, whose great work "The British Museum Catalogue of Fishes," has furnished almost all the material for our account of the distribution of the class. In that work all existing fishes are arranged in six sub-classes and thirteen orders. A study of the extraordinary _Ceratodus_ from Australia has induced Dr. Günther to unite three of his sub-classes; but as his catalogue will long remain a handbook for every student of fishes, it seems better to follow the arrangement there given, indicating his later views by bracketing together the groups he now thinks should be united. -----------------------------------------+---------+--------------- {102} Sub-class. Order. |Families.| Remarks. -----------------------------------------+---------+------------------ { 1. Acanthopterygii | 47 | Gasterosteidæ to { | | Notacanthi. { 2. Do. Pharyncognathi | 5 | Pomacentridæ to { | | Chromidæ. Ganoidei { 3. Acanthini | 6 | Gadopsidæ to ======== { | | Pleuronectidæ. {Teleostei { 4. Physostomi | 29 | Siluridæ to { { | | Pegasidæ. { { 5. Lophobranchii | 2 | Solenostomidæ and { { | | Syngnathidæ. { { 6. Plectognathi | 2 | Sclerodermi and { { | | Gymnodontes. { | | {Dipnoi 7. Sirenoidei | 1 | Sirenoidei. { | | { { 8. Holostei | 3 | Amiidæ to { { | | Lepidosteidæ. {Ganoidei { 9. Chondrostei | 2 | Accipenseridæ and { | | Polydontidæ. | | Chondropterygii { 10. Holocephala | 1 | Chimæridæ. { 11. Plagiostomata | 15 | Carchariidæ to | | Myliobatidæ. | | Cyclostomata 12. Marsipobranchii | 2 | Petromyzontidæ and | | Myxinidæ. | | Leptocardii 13. Cirrhostomi | 1 | Cirrhostomi. +---------+ Total 116 families. ----------------------------------------------------------------------- INSECTS.