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, Saury, Half-beak, Flying Fish), 619—Esocidæ (Pike), 623—Galaxiidæ, 624—Mormyridæ, 625—Sternoptychidæ, 627—Stomiatidæ, 629. Families of Physostomi continued—Salmonidæ: Salmo, difficulty of distinguishing species, 630; constant specific characters, 635—hybrids, 638—sexual development, 638—migratory species and their retention in freshwater, 639—Growth of Salmonoids, 641—their domestication and acclimatisation, 641—species enumerated, 642—Smelt and Capelin, 646—Coregonus, 647—Grayling, 649—marine genera, 650. Families of Physostomi continued: Percopsidæ, 651—Haplochitonidæ, 651—Gonorhynchidæ, 652—Hyodontidæ (Moon-eye), 653—Pantodontidæ, 653—Osteoglossidæ, 653—Clupeidæ (Herrings, Anchovies, Shads, Mossbanker, Menhaden, etc.), 655—Bathythrissidæ, 663—Chirocentridæ, 663—Alepocephalidæ, 664—Notopteridæ, 664—Halosauridæ, 665—Hoplopleuridæ, 665—Gymnotidæ (Electric Eel), 666—Symbranchidæ, 668—Murænidæ (Eels, Congers, Murænas, etc.), 669.

Families: Solenostomidæ, 678—Syngnathidæ (Pipe-fishes, Sea-horses), 679.

Families: Sclerodermi (File-fishes, Coffer-fishes), 684—Gymnodontes (Globe-fishes, Sunfish), 686.

Families: Petromyzontidæ (Lampreys), 691—Myxinidæ, 694.

Family: Cirrhostomi (Lancelets), 696.