Suborder Gobioidei, the Gobies: Gobiidæ.—Suborder Discocephali, 459 the Shark-suckers: Echeneididæ.—Suborder Tæniosomi, the Ribbon-fishes.—The Oarfishes: Regalecidæ.—The Dealfishes: Trachypteridæ. CHAPTER XXVII. SUBORDER HETEROSOMATA. The Flatfishes.—Optic Nerves of Flounders.—Ancestry of Flounders.— 481 The Flounders: Pleuronectidæ.—The Turbot Tribe: Bothinæ.—The Halibut Tribe: Hippoglossinæ.—The Plaice Tribe: Pleuronectinæ.— The Soles: Soleidæ.—The Broad Soles: Achirinæ.—The European Soles (Soleinæ).—The Tongue-fishes: Cynoglossinæ. CHAPTER XXVIII. SUBORDER JUGULARES. The Jugular-fishes.—The Weevers: Trachinidæ.—The Nototheniidæ.—The 499 Leptoscopidæ.—The Star-gazers: Uranoscopidæ.—The Dragonets: Callionymidæ.—The Dactyloscopidæ. CHAPTER XXIX. THE BLENNIES: BLENNIIDÆ. The Northern Blennies: Xiphidiinæ, Stichæiniæ, etc.—The 507 Quillfishes: Ptilichthyidæ.—The Blochiidæ.—The Patæcidæ, etc.— The Gadopsidæ, etc.—The Wolf-fishes: Anarhichadidæ.—The Eel-pouts: Zoarcidæ.—The Cusk-eels: Ophidiidæ.—Sand-lances: Ammodytidæ.—The Pearlfishes: Fierasferidæ.—The Brotulidæ.— Ateleopodidæ.—Suborder Haplodoci.—Suborder Xenopterygii. CHAPTER XXX. OPISTHOMI AND ANACANTHINI. Order Opisthomi.—Order Anacanthini.—The Codfishes: Gadidæ.—The 532 Hakes: Merluciidæ.—The Grenadiers: Macrouridæ. CHAPTER XXXI. ORDER PEDICULATI: THE ANGLERS. The Angler-fishes.—The Fishing-frogs: Lophiidæ.—The Sea-devils: 542 Ceratiidæ.—The Frogfishes: Antennariidæ.—The Batfishes: Ogcocephalidæ. LIST OF ILLUSTRATIONS VOL. II. PAGE Shoulder-girdle of a Flounder, _Paralichthys californicus_ 2 _Palæoniscum frieslebenense_ 14 _Eurynotus crenatus_ 15 _Dorypterus hoffmani_ 16 _Chondrosteus acipenseroides_ 18 _Acipenser sturio_, Common Sturgeon 19 _Acipenser rubicundus_, Lake Sturgeon 20 _Scaphirhynchus platyrhynchus_, Shovel-nosed Sturgeon 20 _Polyodon spathula_, Paddle-fish, side-view 21 _Polyodon spathula_, Paddle-fish, view from below 21 _Psephurus gladius_ 21 _Gyrodus hexagonus_ 22 _Mesturus verrucosus_ 23