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: CHORD AT A (VERTEBRATES). 



Class : Marsipobranchii, Lampreys, PalcBospondyliis, Hag, Lam- 

 prey, Ostracoderms. 

 Class : Pisces (True Fishes) . 



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



Order: PleH?'opterygii (T)t2in)^ Cladoselachids {Titzn). 

 " Ichthyotonii (Cope), PleiiracantJiids. 

 " Selachii, Sharks and Rays. 

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



Order : Chimaeroidei, Sgualoraiids, Myriacanthids^ 

 Chimaerids. 



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



Order : Sirenoidei, Dipto-ids^ Phaneropleu7'ids, Cte- 

 nodonts^ Lepidosirenids. 

 " ? Arthrodira, Coccosteids^ Mylostomids . 



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



(Teleosts) . 

 Order : Crossopterygii, Holoptychiids^ Osteolepids, 

 Onyc/iodonts, Ccelacaiithids . 

 " 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. 



