SCHEME OF CLASSIFICATION XVil 
Sub-Class. Order. Sub-Order. Division. 
| | Sclerodermi 
ET | Teleostei_ | Plectognathi |‘? /?”) 
em es (continued) (pa 721) ~ 
(continued) Gymnodontes 
(p. 725) 
DIPNEUSTI ( 
—DIPNOI - 
(p. 505) 
OF UNCERTAIN 
Order. 
PALAEOSPONDYLIDAE (p, 521). 
HETEROSTRACI (p. 524) 
OSTRACODERMI (p. 522) 
OSTEOSTRACT (p. 527) 
ANASPIDA (p. 531) 
ANTIARCHI (p. 532) 
ARTHRODIRA (p. 535) 
Fainily. 
( Triacanthidae (p. 722). 
Triodontidae (p. 723). 
| Balistidae (p. 728). 
_ Ostraciontidae (p. 724). 
( Tetrodontidae (p. 726). 
, Diodontidae (p. 726). 
| Molidae (p. 726). 
~ Ctenodontidae (p. 505). 
| Uronemidae (p. 507). - 
| Ceratodontidae (p. 507). 
| Lepidosirenidae (p. 511). 
POSITION 
Family. 
hee (p. 524). 
J) Drepanaspidae (p. 525). 
Psammosteidae (p. 526). 
| Pleraspidae (p. 527). 
( Ateleaspidae (p. 528). 
Cephalaspidae (p. 528). 
| Tremataspidae (p. 530). 
Birkentidae (p. 531). 
Asterolepidae (p. 534). 
* Coccosteidae (p. 536). 
