SYSTEMATIC AND DESCEIPTIVE PAET. 

 First Sub-class — Pal^ichteCyes. 



PAGE 



First Order — Chondropterygii . . . 313 



I. Plagiostomata . . . . . 313 



A. Selachoidei — Sharlcs . . . . . 314 

 Families: Carchariidae (Blue Shark, Tope, Hammer-liead, 



Hound), 316 — -Lamnidse (Porbeagle, Carcharodon, 

 Fox-Shark, Basking-Shark), 319 — Rhlnodontidae, 

 323-Notidanidae, 324— Scylliidsi (Dog-fishes), 325 

 Hybodontidae, 328 — Cestraciontidae (Port Jackson 

 Shark), 328 — Spinaoidae (Spiny Dogs, Greenland 

 Shark), 330— Rhinidse, 334— Pristiophoridie, 335. 



B. Batoidei — Bays . . . . . .335 



Families : Pristidas (Saw-fishes) 336 — Ehinobatidae, 337 



— Torpedinidje (Electric Rays), 338 — Rajids (Rays 

 and Skates), 340— Trygonidis (Sting Rays), 342— 

 Myliobatidae (Eagle Rays), 344. 



II. Holocephala . . . . . . .348 



Family : Chimseridse, 348. 



Second Order — Ganoidei . . . . .350 



I. Placodermi . . . . . . .351 



II. Acanthodini . . . . . .355 



III. Dipnoi 355 



Families : Sirenidas (Lepidosiren, Protopterus, Cera- 

 todus), 355 — Ctenododipteridse, 359 — Phanero- 

 pleuridsE, 360. 



IV. Chondrostei . . . . . . .360 



Families: Acipenseridse (Sturgeons), 360 — Polyodontida;, 

 362. 



