8 FISHES IN GENERAL 



The present writer has, however, retained in the main 

 the classification of Smith Woodward, in which Fishes 

 (Pisces) is looked upon as a class, and is made to include 

 as sub-classes, (I.) Sharks, (II.) Chimaeroids, (III.) Lung- 

 fishes, and (IV.) Teleostomes. A tabular grouping of the 

 fishes is shown below. And on the opposite page their 

 geological distribution is indicated. 



TABLE I 



A CLASSIFICATION OF FISHES 



Type: CHORDATA (VERTEBRATES). 



Class : Marsipobranchii, Lampreys, PalcEospondybcs, Hag. Lam- 

 prey, Ostracoderms. 

 Class : Pisces (True Fishes) . 



I. Sub-class: Elasmobranchh, Sharks and Rays. 



Order: Pleuropterygii {D&diVi), Cladoselachids ij^fax^). 

 " Ichthyotomi (Cope), Pleuracanthids . 

 " Selachii, Sharks and Rays. 

 II. Sub-class: Holocephali, Chimaeroids, Spook-fishes. 



Order : Chimaeroidei, Sqicaloraiids, Myriacanthids, 

 Chimaerids. 



III. Sub-class: Dipnoi, Lung-fishes. 



Order : Sirenoidei, Dipterids^ Phaneropleurids, Cte- 

 nodonts^ Lepidosirenids. 

 " ? Arthrodira, Coccosteids, Mylostomids . 



IV. Sub-class : Teleostomi, Ganoids and Bony Fishes 



(Teleosts). 

 Order : Crossopterygii, Holoptychiids, Osteolepids, 

 Onychodonts, Ccelacatithids . 

 '* Actinopterygii, 



Sub-order: Chondrostei (Ganoids), Palceoniscoids., 

 Sturgeons, Garpikes, Amioids. 

 " Teleocephali, recent Bony Fishes (Tel- 



eosts) . 



Note. — The groups italicized are represented only in fossil forms. 

 The derivations of the scientific names are given on pp. 227-230. 



