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.) Chimezeroids, (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, Paleospondylus, Hag, Lam- 
prey, Ostracoderms. 
Class: Pisces (True Fishes). 
I. Sub-class: ELASMOBRANCHII, Sharks and Rays. 
Order: Pleuropterygii (Dean), Cladoselachids (Dean). 
os Ichthyotomt (Cope), Pleuracanthids. 
= Selachii, Sharks and Rays. 
II. Sub-class: HOLOCEPHALI, Chimeroids, Spook-fishes. 
Order: Chimeroidei, Sgualoraiids, Myriacanthids, 
Chimeerids. 
III. Sub-class: Drpnot, 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, Calacanthids. 
= Actinopterygii, ; 
Sub-order: Chondrostei (Ganoids), Paleoniscoids, 
Sturgeons, Garpikes, Amioids. 
a 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. 
