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, Palasospondylus, Hag, Lam- 

 prey, Ostracodenns. 

 Class: Pisces (True Fishes). 



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



Order: Pleuropterygii (Dean), Cladoselachids (Dean). 

 IcJiHiyotomi (Cope), Pleuracantliids. 

 Selachii, Sharks and Rays. 

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



Order : Chimaeroidei, Squaloraiids, Myriacantliids, 

 Chimaerids. 



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



Order : Sirenoidei, Dipterids, Phaneropleurids, Cte- 



nodonts, Lepidosirenids. 

 ? Arthrodira, Coccosteids, Mylostoniids. 



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



(Teleosts). 

 Order : Crossopterygii, Holoptychiids, Osteolepids, 



Onyc/iodonts, Ccelacanthids . 

 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. 



