SYSTEMATIC AND DESCRIPTIVE PAET. 



FiKST Sub-class — PALiEiCHTHYES. 



PAGK 



First Order — Chondropterygii . . . . 313 

 I. Plagiostomaia . . . . . . 313 



A. Selachoidei — Sharks . . . . .314 



Families: CarcliariidiB (Blue Shark, Tope, Hammer-head, 

 Hound), 316 — Lamnidte (Porbeagle, Carcharodon, 

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

 323— Notidanidaj, 324— Scylliida; (Dog-fishes), 325 

 Hybodontidae, 328 — Cestraciontidte (Port Jackson 

 Shark), 328 — Spinacidse (Spiny Dogs, Greenland 

 Shark), 330— Rhinida?, 334— Pristiophoridse, 335. 



B. Batoidei — Bays . . . . . .335 



Families : Pristidge (Saw-fishes) 336 — Rhinobatidse, 337 

 — Torpedinidffi (Electric Rays), 338— Rajidfe (Rays 

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

 Myliobatidfe (Eagle Rays), 344. 



IV. Chondrostei . . . . . . .360 



Families : Acipeuseridse (Sturgeons), 360 — Polyodontidse, 

 362. 



